@Waverunner
I also get the feeling like i'm going to pass out when falling asleep. I've tried to describe this to others and they think i'm nuts. But its so hard to describe things, for all we know, we are using the same terms yet having different experiences (let alone mechanisms).
One reliable trigger for me is the evening after I get blood drawn, and the higher the amount of blood taken, the stronger more long lasting the reaction. If i try to explain this to phlemotmists, they assume i'm talking about vasavagal syncope from a blood draw and offer to have me lying down with feet up. I try to explain, no, its hours later when i lie down to sleep and they get puzzled looks.
will be curious to know how the vasodilater/h1 blocker works for you, I'm reluctant at this point to try more meds given my state has gotten too complex and i react badly to many meds . (CFS, sjogrens, dysautonomia, extreme tyramine senstivity, likely low MAO-A enzyme (not from meds), very likely MCAS, likely complex regional pain syndrome in shoulders, excess sympathetic ouflow, taurine wasting, high beta alanine). I feel like not even other zebras want to graze with me anymore..