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....one bit to consider, if even logistically possible for you, is to p/u and return tanks yourself. the O2 shop i used thought it amusing but appreciated. one phone call and i would have all my tanks in a rack waiting for me on arrival...quick switch out and on my way. this would also allow me to pop my head in the back room and chat/thank the techs. they usually don't see their clients, and i have always believed a face to the name is a game changer...once was handed an m60 regulator, no charge, with "use as long as you need" ...i still have it........

good for you!!!!!!!!!!! but to the extent you can, keep pushing for a big tank -- an M tank, or an H tank. they ought to have them, and it'll save them a lot of trouble if you have one. aside from e tanks being small, it is not unusual for the effectiveness of O2 to go down when the amount of O2 in the tank reaches some level -- half full; one-third full -- so you can be getting less useful O2 than the tank holds. You're going to be calling them a lot (as i think others have mentioned, the O2 delivery person should be your new best friend, and you might get some extra or bigger tanks from them). i'm not sure what a "travel tank" would be, but anything smaller than an e is hardly worth it. e is plenty portable. with your current mask, block the open holes on the front of the mask with tape, or with your thumb as you inhale, so you're keeping room air out. cut the strap -- you don't want to fall asleep with the mask on your face. press firmly to your face so there are no leaks. normally, the recommendation is to stay on the O2 for some time after the attack has been stopped, so that you might prevent subsequent attacks. five minutes, some say; others say for roughly as long as it took you to stop the attack. many people turn down the regulator as they do this. you should do this, but with an e tank you hate seeing the tank contents go down.