Throwaway for privacy.
This will start off sounding like a humble brag, I accept that. This past Saturday, the 16th, my husband (34M) and I (29F) had our first ENM experience. We met a pansexual female we were both interested in at a kink vetting event through FetLife a few weeks ago. She reached out and wanted to go out for drinks. Obviously, we ended up taking her home and having our first threesome.
Now that context is out of the way, here's my issue. She was very excited to eat me out so she ended up going down on me for at least an hour collectively while we switched off using my husband. She was enjoying herself and did not want to get out from between my legs. By the time we were done, I was lightheaded and shakey. At about 4AM, ~4 hours later, I awoke shaking like a leaf. I was highly anxious, nauseous, had heart palpitations, and my stomach felt like a washing machine. I did actually vomit. It lasted off and on for about 12 hours. Light googling makes me think I had an adrenaline dump from being in a high state of pleasure for so long.
Has anyone experienced this before? We both have no negative feelings regarding the experience and, in fact, we cannot wait to get our hands back on her this Saturday. I would like to avoid this again because I'm only starting to feel "normal" again today, 3 full days later.