You will just feel better and better, with more energy than you had in a long time. It was the best thing I ever did! Without that monthly energy sap, you'll feel so good, and if you gradually add exercise every day, you won't put on weight. I did have a problem with tiring easily when I first went back to work. Don't go back too soon. I recommend the Hystersisters website, for good message boards and stories and advice. You're doing great!
Since you almost feel like you're starting a new life, it's a logical time to start eating healthier too. Good for you!