How do i get rid of lose fat round my tummy (without surgery)?

I have lost over 7 stone in the last 9 months, i have gone from over 22 stone to under 15 stone. I have lost it by going to the gym and eating better. 9 months ago i came out of a very stressful and unhappy marriage were i ate to comfort myself. I now feel really good and happy with myself, i have energy i never had and enjoy doing active things with my kids and when i get down to 14 stone im going to do a tandum skydive. The only problem i have is as i have lost so much weight my skin hasn't shrunk as much as it should so i still have man and the skin still goes over my belt, although my trousers aren't tight. im still at the gym but up until know have only done swimming and exercises and not been near the weights. Could any body suggest what i can do to firm my skin? Its probably not as horrific as i have described but i wont to get rid of it?