welcome humpty dumpty! have you consulted with your doctor to see what kind of exercise you are allowed to do? walking isnt really considered heavy regime exercise but you should still check first to make sure its okay. in the meantime, just cut out all the junk and start drinking LOTS of water. also split your meals into 5 small ones and prepare some fresh fruit and veggies precut so when you feel like snacking, your less likely to go for the higher calorie things.