Well, maybe this is one time when gall bladder surgery is a good thing. Maybe it is infected and diseased whether it has Gallstones in it or not. I don't have any medical training, but it sounds significant that you are getting the same opinions from more than one medical source.
This idea is just a thought, stimulated by David, above.
An Ascaris can be as big as a garter snake. See CZ gallery of parasites where one is in a big jar. If one of those nasty things got in that area & took up residence I am just wondering if it could cause you to have that pain.
How to get rid of any if so: Take Wormwood tincture on a mostly empty stomach. Do this on a weekend because it can have some side effects like abdominal cramping & maybe mental spaciness. About 3 hours later take some Bentonite clay and psyllium to help push it out. Try not to eat much at all for a few more hours. The Wormwood only stuns it, but the p & b moves it on out while it is stunned. You want clear pathways for these products.
The next morning take some magnesium citrate to help clean anything out.
I tried this approach while doing parasite cleansing, not trying to get out an Ascaris (I was totally clueless at what was to appear) but just as one of several experiments.
What came out shocked the heck out of me.
This is tricky. You might not even have such a monster. If you are already in pain then you maybe don't want to aggravate it with possible cramping from Wormwood .
I don't know if you are a religious person so I don't want to offend you but I have been praying for you to know what to do regarding this whole issue. You are in quite a quandry there and have my sympathy for sure.
Please inform us on how this issue gets resolved. We may all learn something.