I'm laughing to myself with how much we all must bother him with e-mails

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His answer is very interesting and when I was having anaphylaxis to all food in 2015, my BP was extremely low (80/50 or lower). But when I became unable to eat food for days at a time due to anaphylaxis, my BP became much more normal around 100/70 and Dr. K also felt it was due to not being under attack from MCAS cytokines, etc.
I wish I could retain and explain the connection between POTS/Dysautonomia and MCAS but all of the experts clearly state it. Also, when I used to post on MCAS boards, almost every single person also had POTS. IVIG put my MCAS into remission in 2016 and it has never returned although I cannot explain why. I hope this is also the case for you.