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