My husband tried the olive oil & lemonjuice flush treatment. But theres still pain. Can u prescribe medicines that dissolves gallstones? He's 34, 83kg.

Health fraud. Your husband was deceived by a phony remedy that produces weird bowel movements that the operators tell the victim are gallstones. Of course it didn't work. I'm glad he has a sensible wife like yourself. You're not going to dissolve gallstones taking stuff by mouth. If they need attention -- and many don't -- get with your physician and/or a good surgeon.
See doc. There are medications that can be prescribed for some patients, but if he is having continued pain he may be a better candidate for surgery. He should see his doc.