in need of advise! whats wrong with my stomach?

Went to taco bell yesterdsy. Horrible idea to begin with I know.
Since 5 minutes after I finished eating, I've had a bad gnawing pain and most of the time sharp in my upper abdomen, when I go to make a bowel movement I can, it takes a bit and doesn't feel complete. Im ok for a minute then BAM the pain is bad!! Should I just take some miralax and wait it out?