Hi and welcome to HCM!
Thanks for posting your query here.
The left lower
abdominal pain in your case suggests a renal colic. Renal colic is presence of stones in the kidney pathway. You have not mentioned your age and what sort of tests conducted. The stones while passing through the passage will cause acute pain. If the diameter of the stone is less than 3mm they will be passed out in the urine without any difficulty. If the size is more than 5mm it causes obstruction and dilatation of the structures called
hydronephrosis. This can be treated by ECSWL-
extracorporeal shock wave lithotripsy or lithotomy.
The feeling to belch is due to the
referred pain caused by the renal colic. Sometimes this will be associated with nausea and vomiting also.
An x-ray of KUB-kidney, ureter, and bladder, or an ultrasonogram of the pelvis will give you a clue of the diagnosis.
An other condition
acute pancreatitis could be a reason for your pain. A thorough blood check and ultrasonogram will give the exact picture.
Hope this is helpful to you
Regards