HELP!

Well - I hit rock bottom today. I have tried dieting MANY times - I lose 5 and gain 10...it's a constant battle. I know I need to cut back on soda - but today really hit hard. As I was leaving for work, I went to grab a soda, as I always do, but today there was only 1. My oldest daughter took the rest, hid it, and filled an empty soda case with water and put it in its place. This hit hard....when you are an embarrassment to your children it's time to make a change. I struggle with weight loss. I have been battling back issues as well - so yes I know overall I need to lose weight, but I need help. I need to exercise, but that has also been difficult with the back issues. Guess it's time to go - GAME ON - and get the scale going in the other direction. Looking for help in all the right places.