You poor thing, the pain is dreadful.
I had gallstones last year, misdiagnosed as a stomach ulcer and consequently ended up with pancreatitis as they were left untreated.
To reassure you though, I went on a very low fat diet for 8 weeks between the pancreatitis and having my gall bladder removed and I did not have any more gallstone attacks.
So, skimmed milk, no butter, cream, oil or cheese. Pretty much cut out processed foods. I did avoid avaocado, yes and eggs. Yes, it wasn't great fun, but I found it easy to stick to as I did not want to trigger any more attacks.
I ate cereals, flatbreads, crackers, soup, chicken, fish, loads of fruit and veg, rice, couscous. Made low fat malted muffins, had caramel Snack a Jacks and Haribo for treats. Eating out was tricky, but I could eat sushi.
You can take co-codamol or have tramadol prescribed, but both of those made me sick, so I stuck with paracetamol and ibuprofen.
Definitely seek a second opinion if you are still in pain however. I'm not the only one on this thread who ended up jaundiced and with pancreatitis.
Good luck OP, hope you feel better soon. For me, the gallbladder removal was not too difficult and I can eat pretty much a normal diet now.