Bleeding and stomach pain?

This has been going on for about a month now but I’ve been having horrible stomach pain as well as off and on rectal bleeding. Ive also have had really bad nausea and dizziness. Ive been to the ER about four times I’d say and they keep saying nothing is wrong.

The pain is so intense sometimes that I can’t move for hours. I haven’t had much of an appetite and I’ve been trying to drink more water.

Am I going crazy?
What should I do?