Hello mellowjohnny and welcome to the forum.
I know how hard it can be (as others on this forum do) to try to get some relief. Other than possibly seeking another doctor’s opinion, you might try asking your physician for a trial of medications called calcium channel blockers. There’s even reports that the the drug, Prozac, when taken in small doses can dilate the blood vessels and prevent attacks, as well as acting as an anti-anxiety. Prozac may not work for everyone, as it didn’t with my attacks, but we’re all different.