Sex with chiari

I know this may be a touchy subjects,but we are(Mostly) adults here and I need advice and to know I'm not alone in this. When I have sex my husband a LOT of pressure always seems to build up in my head/on my brain,I get the head pressure a lot anyways throughout the day most days, but it never fails during sex. It builds up so much it feels like my head is going to explode, and often my heart races so fast (190 bpm, I also have P.O.T.S.) it gets to where I cant breathe and occasionally pass out. I have brought this up to both my cardiologist and neurologist with no help from them. Does this happen to anyone else,if so what do you do for it?

Rosey, you may like to check out previous discussions on this topic:- http://www.chiarisupport.org/main/search/search?q=sex

Thank you jules.