well i was doing legs.. this is probably the second week this month i've missed workouts due to vacation and what not, but from now on im going to be consistent.. anyway i hadnt done legs in a while.. halfway thru the workout, i started feeling really nauseous almost like i was going to throw up.. i went an sat down for a few minutes.. after about 2 minutes the room started looking really bright and then i broke out into an instant sweat.. after which i felt completely better.. any ideas what this is.. needless to say.. i had decided i had enough for the day an went home not finishing legs.