I get migraine like symptoms after i workout, what is this caused by?

None.........: Atypical migraine can happen with unusual causes..........I would suggest you to go to headache specialist to make sure that you have atypical migraine.

Degenearative joints: Do u get an aura? If not I am guessing that u may have some degenerated joints in your neck. That can also cause headache after vigorous excersize due to pinching of nerve roots.

Exercise migraine: This is not all together uncommon. You should see a neurologist with interest in treating patients with migraine variants.