Cortisol definitely plays a part. Happens to alot of people. Glutamine will help too. I try to take it easy right at the beginning of pct. I am probably the only guy this happens to, but Toremifene messes me up and I get sick. I have a bad reaction to Torm. I am fine with Nolva and Clomid, but Torm kills me. My last pct was all natty and I felt great. No sickness or problems. Resveratrol and I3C will always have a place in my pct's now, as they are good for immunity as well.