Cramping tearing pain, occurring after meals could be indicative of gastritis, peptic ulcers, GERD. However if you have had EGDs done this would be seen and diagnosed at that time. However the fact that you are on Nexium indicates that there was concern for GERD, gastritis or ulcers. Since you are also having diarrhea with this pain you should look into any infectious process. Since intolerance, celiac etc have been ruled out this could also be IBS
My dad had his gallbladder taken out, so could this be symptoms of that?
This certainly could.
But it seems like studies have looked into this and have been negative
The Ultrasound would be able to pick up on that
Do you have any other questions?
The other thing that you should look into is food allergies.
These can cause the symptoms you are having
For this seeing an allergist may be necessary to get food allergy testing done
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