Stomach pain and doctor can't tell whats the problem? Had X-rays and nothing was found.

The pain is very sharp and wakes me up in the middle of the night at least 3 times of the week. After every meal I start feeling discomfort and have to run to the bathroom. I don’t know what else to do any more went to the urgent care they did X-rays and nothing showed up blood test was also good. Please help me!