I am so sorry to hear that you are going through that. I don't know if i can be of any help but I do know that you are not alone!I've had IBS D for a very long time. About 5 yrs ago I used to get just what you are describing. It lasted about 3 yrs then stopped (the attacks averaged about once a week). (The IBS D didn't stop though)- just the horrible heat, sweats, and passing out.I don't know what brought it on or why it went away??? I do know that it started right after my second child was born and also when I started getting the flu shot. Don't know if there is any connection to either????I got the flu shot for 3 yrs in a row, then I thought that maybe that was doing it to me-so I stopped getting the flu shot and the heat, sweats, and passing out stopped!Don't know if the flu shot was doing something to my immune system or not??Drs. claim it is not a live vaccine, so it shouldn't cause any of those problems??SO whether it was IBS related,hormone related, or immune system related- who knows!!! Never could find a dr. who could figure it out!Hopefully, it will pass for you too......I pray it does.......Tired