Hi there!
Well, without a clinical evaluation it would be difficult to determine the cause of your symptoms. Possibilities that may need to be considered include GI/ GU infections, inflammations, pancreatitis, diverticulitis, GI motility disorders, growths/ masses, referred pain from other regions etc. I would suggest getting this evaluated by a primary care physician initially and depending on the cause diagnosed/ suspected, it can be managed accordingly or specialist care may be sought.
Hope this helps.
Take care!