I was working out at my gym this past thursday and was doing a chest day. I was on my final set of pec deck flys and was straining to get my 6th and final rep. I strained about twice as long as I normally do, just not willing to give up. I'm sure you all know the type of set I'm talking about. So right after I finish I get up and not but 10 seconds later I start getting a crippling, pulsing migraine that lasted for like 20 seconds. The headache passed and I continue with my workout. Ever since that night, whenever I exert much energy at all, the migraines return and are just crippling. Literally puts me down and I have to wait it out. I have told myself that if they continue until tuesday that I will go see a doctor. I was wondering if this is something common that others have experienced, or if this sounds like something that could be more serious? Thoughts ? Opinions? Flames? Thanks for your time.