Lost weight the easy way and gained it back

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Hi I'm Bmoviemama and I lost almost 90 pounds from October 2009 to 2010 and gained most of it back over a year. I joined a doctor supervised weight loss program that had me taking Phendimetrazine three times a day and eating a very low calorie low carb diet. I have been off of it for a year and have gained back all the weight except for 4 pounds! I am here now to loose the weight the right way by eating right and exercising. The program I was in did not encourage exercise. As you can imagine I am frustrated and depressed. I got rid of all my size 22 clothes and was in a size 14 only to turn around and have to start buying 22 again. Any and all encouragement is appreciated :)