Does anybody else get this? When ever i go running, be it on station with the PE'd guys or by myself like i just have done, about 5 minutes into the run i start needing to be sick? I don't sprint so i don't think its lactic acid, and its normally an hour-two hours after ive eaten so i don't think its that, ive just been for a 2 mile run by myself now, stopped twice for 2 minutes because i was gipping, any ideas?