I would highly recommend that you get a second or even third opinion from a Dr, if you have not already.
I've been to 3 different Dr's (my regular Dr, Gi Dr & a surgeon) who all say my gb needs to be removed. I'm seeing a second surgeon Monday & want this gb out... I don't have stones, but I do have a small polyp. I've had all the tests...ultrasound, Hida scan, Cat-Scans...upper endoscope, colonscopy, barium enema...all tests came back normal-- other then seeing the polyp via ultrasound. I have all the classic symptoms of gallbladder disease & the pain, & it's only getting worse. I know of a few people who had no stones, had all the symptoms & when they got there gb out it was inflamed... There is a condition called acalculous cholecystitis, which can occur without the presence of stones.
Hope you feel better soon...
Heather