About once every few months

I wake up multiple times in the middle of the night and can't sleep at all until morning. I don't feel well in the morning and have no appetite to the point where I can't think of anything I want to eat, but since I'm hungry, I force myself to eat. Then about 30 minutes later, I get stomach pain so bad I break out in a cold sweat. I really wish this would stop. It's excruciating pain every time, to the point where I momentarily consider calling an ambulance, and I feel unwell for a while afterward, which is a problem.