I had my gall bladder removed december 2002.... I found it very depressing too. You don't really get to do anything... It sucks!
It was painful for about a week, tender for 2-3 weeks.
If you don't rest and get the proper amount of time to heal, it can cause severe pain.
If it doesn't seem to be getting better in the next few days maybe you should go back to your doctor.
Good luck!