Hi, I found a great doctor today who literally sat down with me for 1 hour and then brought in another colleague to figure out what's wrong with my 22 year old body that was healthy and then crashed suddenly after surgery. My oxygen saturation at rest is 99 which he said was excellent but upon exertion i told him that i feel faint and can't breath and will pass out. He had me walk around with the monitor and after about 50 steps i got real faint and felt like i couldn't breath. Just as i had described to all my doctors, that i "felt like i'm not getting enough oxygen". To which my oxygen saturation dropped to 89 and kept dropping but i had to sit down. stopped it there. He couldn't figure out what was wrong with me and my lungs are fine and have been. The only issue he can think of is related to hematology and all traces back to anesthesia that was used for my surgery. Are there any CFS patients that have this problem?