Wow..this is really eye-opening to me! The symptoms you describe with regard to "flares" such as nausea, faintness, and dizziness I have experienced myself. I've had 2 incidents of this so far that I can recall. I never realized those symptoms were my TOS flaring up. The 1st time I was just sitting on my couch watching TV and all of a sudden I felt really dizzy and slightly nauseous, almost like I could faint. My husband had to open the window so I could breathe in the cool air or I really think I could have fainted. The 2nd incident was about 2 weeks ago. I went out to see a movie with my family and while was out, I felt progressively worse. I thought I was getting the flu because I felt really nauseous, fatigued, and my body felt like it was on fire, but I had no elevated temperature. The next day, I felt much better and was able to go to work. I've just been recently diagnosed with TOS and all this is honestly scaring me to death. I never know how I am going to feel from one day to the next and sometimes I feel just horrible. I'm glad this support group exists because I don't know where I'd be right now without all this info and all these caring people. Thank you so much!