Your only complain is mild muscle spasm on the left side of the abdomen.
You have had treatment for Ulcers - Protonix
Levsin - is given for spasmic pain.
During this time you had done a complete medical work-up for entire gastro intestinal system and also checked your heart and brain.
I belive you must have a complete blood workup during which you found low potassium level and got treated for it.
You have no started taking antidepressants. which are known to cause constipation
Now, you may try taking dicyclomine
. If you find this problem persisting still. then it may be smooth muscle
problem which i am sure your doctors must have given a thought or a psychological problem,
For which You may need a psychiatrist
counselling regarding this illness.