I need to lose weight, in 2003 I had my gallbladder removed and gained about 45 lbs in a mth, then feb 2004 I?

had to have a hernia repair, did lots of exercise with no luck then in jan 2006 I was in a wreck and really messed up my should I finally had surgery june this yr, I also had a lump fremoved in feb this yr. I feel like my body has fell apart. what can I do other than walking to lose weight (swimming is not an option yet) also what food should I eat I have to avoid dark green because the really upset my stomach due to no gall bladder, everyone say I should have lost weight after the gallbladder surgery but no luck I was 130 before my gall bladder surgery now at 180 please help