I don't know anything about the A-fib (fortunately), but sorry to hear about both. I know health problems come with age, but they still stink.
As far as the gall bladder goes, mine gave me trouble for years and no one could ever figure out what it was. Mostly doc thought it was an ulcer. Finally had the upper gi after a trip to the ER one night - I was sure I was having a heart attack. Surgeon said it was the worst she'd ever seen - had to make the incision to take it out 3x bigger because of all the stones. But getting rid of it got rid of a lot of pain and nausea and vomiting I'd had over the years. I did have to go urgently and often after the surgery, but that's gotten a lot better over the years (it's been 17+), though it still hits me like that once in awhile. Really greasy foods are all that bothers me since, though the night I thought I was gonna die, it was a chefs salad with bleu cheese dressing that put me down. I still don't do bleu cheese dressing...
I ended up in the hospital overnight and couldn't do much for a couple of weeks. The best advice I've got is take a pillow to hug while riding in the truck - it really does help.