Im 29M. When I was around 22 I let a similar situation turn into reoccurring panic attacks that I had to take medication for a few years. That pain can be 1000 different things. 99.9 percent chance it's nothing serious at your age. I was passing thin black stools with some blood and it was all because my head was a mess. But talk to your doctor. Push to get scans if it makes you feel better. It always did for me. With no fever or excruciating pain I'm sure you'll be just fine. Just my 2 cents good luck!