Well THAT gives me comfot, knowing I am not alone! (not that I am happy at all knowing you feel awful after exercise!) I, too, feel like crap after exercise, and have to incorporate it into my life more, trying for better health and for stress relief - but have been waiting for the "feel good after" part! Never ever thought it might be die off! I have often thought that an Epsom Salts bath after would feel so good, but alas, we have no tub.