Thanks for all these additional information.
I understand your concern.
Well as you describe,possible causes may include Peptic ulcer,Ureteric colic,Intestinal spasms, mesenteric adenitis.
Sometimes gall bladder disease ,pancreatitis,Appendicitis associated pain starts initially near belly button area.
However chances of these conditions are less with no other associated symptoms you have.
You can take OTC Prilosec and do warm compresses with a heating pad.
Also take OTC Mylanta gas to relieve intestinal gas and bloating.
Also you should hydrate yourself with plenty of fluids.
As you feel somewhat better with Nurofen so try such self care measures and wait for an hour to see if they respond to your symptoms.
To make a diagnose, you need to get few tests-
-Endoscopic retrograde cholangiography (ERCP)
-Complete blood count (CBC)
-Pancreatic enzymes blood test
Also, Testing for H. pylori would be needed.
Once cause is diagnosed, accordingly line of treatment would be selected.
Considering severity of pain even if such measures wouldn't provide relief then I would suggest that you should not delay and see your doctor in ER ASAP.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
Please use the REPLY BUTTON to reply back to me. It's request to avoid poor/bad rating.
It’s my pleasure to continue this conversation until you satisfy.
Waiting for your response.