If your CT Scan is normal, there does`nt appear to be much cause for worry. You may be suffering from colitis
in which there is excessive gas production and bloated feeling. You may take a course of Taxim- Ornidazole
combination, a PPI like Pantaprazole and a probiotic
for 5 to 7 days. These will help. I hope CT Scan of upper abdomen is also normal. If symptoms persist, consult a GI Physician.