yes I feel bad all the time too, like ive hiked up hill with a heavy pack solid for a day after being very unfit and I have a very bad hangover from drinking too much on the same night of that tramp. Im worse if I do more the following day as well. not to mention a plethora of other things including cognitive. JULIA NEWTON yay! This is the sort of stuff that breaks the camels back eventually! really hope someone is in line to replicate!