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I have had pain similar, and idk about your hospital experience, but in mine they would basically watch me in pain and send me home, then all that got accomplished was them getting paid. This may sound harsh, but you will have to deal with the pain next time or go to a doctor or make an appointment with a gasterointerologist. Most hospitals will not know what to do, unless the dr or gi already works there, then they will perform tests that will unfortunately make you feel a bit worse, but then again there are some tests where you will feel absolutely nothing.
You may want to try a restricted diet. the BRAT diet. Its Bread, Rice, Applesauce, and Toast. There are more to the diet but it is basically bland food your stomach can easily digest, you will basically have to reteach your stomach how to work properly bc as you know, and feel, having diarrhea, vomiting, muscle spasms, and other things is a very tiring and excruciating, traumatic experience.
Try to start keeping a journal of what and when you eat and when you have pain and the experience. It could show a link to some food allergy or intolerance, or if you're stressed or other things. Also, try to drink more water to help the food digest easier. It is a small tip that would have helped me sooner had I listened.
Hope you feel better
xoxo