Anybody had their gallbladder taken out?

I'm scheduled to have my gallbladder taken out. I have gallstones and acid reflux and I gained 18 pounds in a month and a half.  I'm in pain everyday it feels like my food ain't digesting or I haven't eating at all. I'm big as ever and it's depressing. anyone had problems with their gallbladder? I'm not pregnant again and when I go shopping I want to cry because I put on so much weight