Hi, everybody seems to be getting PEM multiple hours *after* activity or even the next day. Well, I don't. I get "P"EM (flu-like symptoms) *instantly* for every moment I keep on going, increasingly. If I was to ride a bike I'd start with almost 0% flu symptoms. * Stage 1: I start getting dry mouth/sore throat. * Stage 2 (maybe 2 minutes): I'd get a running nose and some ear problems. * Stage 3 (after 3 minutes): I'd feel fever-ish and dizzy. Now I'm at 100% flu symptoms and have to abort and rest. During the next 15 minutes (lying down) the flu symptoms will continue to worsen. Then, after about 30 minutes I'm slowly recovering and will stay at about 50% flu symptoms for the rest of the day, ~30% flu symptoms the following day and almost 0% two days after. This has been going on for years and is 100% reproduceable. If I was to abort at Stage 1 or 2 it turns out basically the same but less severe. Now the "timeout" for stage 1-3 somewhat varies on a per day basis. It might be longer for lucky days and as short as a few seconds when I'm at my lowest. Flu-like symptoms emerge "real-time" as long as I keep going. But why? Any help is appreciated! Thanks!