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Not to rebut CHF's excellent post, but I would suggest one 60 and one 90. The 60 is not required to be capped when traveling, so you can have your mask attached to it on the road. It is not an issue for me to lift and load. BTW - I am old with a torn rotator cuff, so that says something. A 90 will last longer of course and I have found the 60 very hard to come by. So, I use one of each and try to keep at least one completely full at all times. Yes, I can haul the 90 too, but it is heavy. Of course the shortage of 60's may be just the people I have to deal with! It really is easy to set up. Just know not to use grease, oil or any lubricant or teflon tape on the threads of the tank when you screw on your mask. You never use those around O2. All that you really need is a big adjustable crescent wrench to attach the mask to the tank. Tighten the nut on the regulator as tight as you can. Turn the regulator off with the dial. Open the valve on the tank and listen - no sound means no leakage. With the regulator off, any hiss of escaping gas would be coming from the nut you just screwed on. I bought them for 'my welding set up' and needed two due to high cutting torch usage. Never had a question asked, just made the statement and paid for the tanks. Owning them, I can have them filled anywhere, not just at the company I rent them from. It is a plus if you travel. And I can go on a 'welding binge' and buy as often as I want with a smile. Hopefully this helps a bit!

Re the Marijuana, during my last cycle (3-4 years ago) the common discussion was that "weed was a trigger" the conversation wasn't very nuanced and i suspect had more emotion than scientific backing - there were some people claiming it was helping them hugely. No one could talk about specific strains or indica vs sativa with any confidence. I have now read that some strains are indeed triggers, but also that some a huge help in busting shadows or just keeping the peak pain level down. Much of what i've read in anecdotal, but last week i experienced it first hand. Like you've i've smoke 15 years +, but this year i have switched how i obtain it and now know with much more certainty what i'm smoking. I had an 80% indica strain supposedly high in cbd, afghanii believe - and it was like someone had just popped the roof of my skull and let all pressure out. It was almost as effective as oxygen. What i have currently, a hybrid amnesia haze, if i have more than 2 or 3 joints before bed, i'll be up with a CH attack within 2 hours. I don't have any left to re-try the indica theory though - so not remotely scientific, but more anecdotal evidence. Your mileage may vary.

Gail, I just posted the following elsewhere here at this board. We have been encouraged to make the disclaimer that using welding O2 is not medically recommended. It's amazing to me that you could abort with a can of Boost. That's great news. >>>Welding O2. The ideal mask is this one: http://www.clusterheadaches.com/ccp8/index.php?app=ecom&ns=prodshow&ref=clustero2kit You can get a standard non-rebreather mask from amazon. You can also get a regulator there. Recommending a specific regulator used to be simpler, because Harbor Freight had a perfect one that was inexpensive. You want one that has an adapter for a barbed fitting that will hold your mask hose most easily and effectively. CGA 540 is the type that fits all welding O2 tanks. This one at amazon looks like it would work: https://www.amazon.com/IMAGE-Welding-Welder-Regulator-Cutting/dp/B00JP9WIF2/ref=sr_1_1?ie=UTF8&qid=1535222274&sr=8-1&keywords=cga+540+regulator And this one: https://www.amazon.com/Yaetek-Regulator-Cutting-0-200PSI-0-4000PSI/dp/B073P1C18S/ref=sr_1_11?ie=UTF8&qid=1535222716&sr=8-11&keywords=cga+540+regulator I just can't say for sure. A welding supply place will sell you a regulator, but they're typically expensive and don't have the barbed fitting (you can buy an adapter with that fitting at many hardware stores for a few bucks). You probably know your way around a welding business a little! You just buy a tank, or a couple of tanks, and do not mention that they're for medical use. 60 cu ft seems like a pretty good size, particularly if you get a couple of them. The bigger the better, of course, but since you have to bring them in to be "refilled" (replaced, actually, usually) you might not want to be wrangling anything much bigger than a couple of 60s. Maybe you'd also want a 40 cu ft for greater portability (car, etc.). You probably also want a cart, too.<<<< More to you, Gail. If you don't feel comfortable with the buying process because you don't know what questions you might be asked, it seems to a lot of people make up some cover story in case they're asked, like their nephew is coming to town and going to do some welding and asked you to pick up these tanks for him. You don't know nothin' beyond that. I believe you have said that you are nearly as old as me, maybe even a year or two older, so just a warning that it could be that tanks more than 40 cu ft will be kind of heavy to schlepp around. A 40 cu ft tank is about 1100 liters, so at 20 lpm that would be about 55 minutes' worth, and about 75 minutes at 15lpm. You might not need a flow rate that high if the Boost helped you, or you might not need much to abort, but obviously you're not going to get more than at most maybe 6 or 7 aborts/tank, and possibly fewer (particularly since my anecdotal experience, and that of some others, is that for some reason the O2 becomes less effective as more O2 has been used).