Two days ago, i did a forward roll on a spring floor at a gym. i had a headache before the roll, and it got much worse after. the bad headache lasted all night but was dissipated the next morning. could i have caused a concussion from a forward roll?

Doubt it. Without passing out immediately, memory loss, dizziness immediately I can't buy into a concussion. Headache is common to the point of being intense from minor trauma. If you would sleep better having an exam, go see your doc and take a list of all related symptoms.

Agree with Dr. Ferguson. It is highly unlikely that you got a concussion. It is good that you are exercising. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV vaccine. Wish you good health!