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If you have significant pain all day, and the attacks that seem like CH are "bursts" as you write (which I think of as briefer than a typical CH attack), and if a triptan doesn't help, it seems possible to me that you might have one of the CH "lookalikes," some form of hemicrania, maybe paroxysmal hemicrania (Paroxysmal Hemicrania: Causes, Symptoms & Treatment) or hemicrania continua (Hemicrania Continua: Causes, Symptoms & Treatment). I'm just guessing here: you can look to see how well the symptoms match. Unlike CH, hemicrania is generally not responsive to triptans or oxygen (or busting, except for some brief relief of maybe a day or two). So one test would be to take the medicine that treats hemicrania, Indomethacin. Another would be to try oxygen. As I say, I'm just guessing here. Sometimes people "try" Indomethacin, but the dosage isn't enough, or it's not continued long enough, to get a real test. This is the recommendation from the International Headache Society: "In an adult, oral indomethacin should be used initially in a dose of at least 150 mg daily and increased if necessary up to 225 mg daily. The dose by injection is 100-200 mg. Smaller maintenance doses are often employed."

Wow, that's terrible, sorry to hear it! If your neuro wasn't a headache specialist, well those are the ideal ones you want to see - it can be quite the long wait to get an appointment with one though, and that seems pretty universal, no matter what country you reside in. Last I checked, verapamil is known for lowering blood pressure, and is even prescribed for treating high blood pressure, so I wouldn't imagine your high blood pressure to be a verapamil side effect. I'll leave the T syndrome (or did they test for "T series"?) abnormality for others who may know about it. Sumatriptan injections have historically been prescribed in too high of a dose, specifically 6 mg, whereas doses of 3 mg (or even 2 mg for those such as myself), are plenty effective at aborting cluster attacks if caught at onset. It could be worthwhile to let us know what kinda sumatriptan and verapamil doses you have been prescribed - if you've been issued the big dose 6mg Sumatriptan (which I would have to think would increase risk of side effects), there are ways to split those injections:

One of the issues we as CH O2 users has been when we have both M and E tanks available to use. The M/Welding tanks use a CGA540 connection, and the E tanks use a CGA870 thus preventing swapping regulators between the two. While I've known of an adaptor that allows you to run M tank regs on E tanks, I've only heard talk of a device that allows to reverse, the ability to use a E tank reg on a M tank. Until now, I didn't think such an adaptor could be sourced, but I finally found it and have tested it myself. It works!! There is a nonstandard seal requirement, but that's easily met. You simply order the thick seals linked below and use them in place of the standard brass/rubber seals we normally use. I have no financial connection to these items, and this is for informational purposes only. You be the judge if this set up is right for you. The adaptor. The seals.