Extreme abdominal pain while working out?!?

Please help, i worked out on my abs today and all the sudden i felt my upper abs were so tight i felt like they were about to pop it was going on for 40 seconds and i had to hit my stomach to let the pain go it still kinda hurts right now. it is my upper abs and 4 months ago the same thing happend to my lower abs. im really nervous that it could just blow up or somethin