I had someone very close to me have an abdominoplasty. She states it was the wrost mistake of her life. It is a MAJOR operation. See if you can watch a video of the procedure before putting yourself on that operation table. Of course the cosmetic surgeon is going to say you are a perfect candidate, he wants your money. You won't be able to stand up straight for about 3 weeks. Your incision could be very ugly, numb and have "bumpy" things on both ends. If you experience future weight gain, the weight will go to your upper stomach and love handles. I am sure your kids don't mind if you have a tummy.
Look at some before and after pictures, the results just don't seem like it is worth the pain that you WILL go through.
I don't think your conditions are related, just an unfortunate string of events that your pregnancy did to your body.