I'm a size 18, but i'm ok with that, just my lower tummy is huge, I don't seem to have the same feeling there anymore either, its slightly numb.
You can have a tummy tuck after the C sections. You do have to be a certain BMI ideally below 30. The surgeon would make the incision in the caesarian scar so you would not have a new scar. It is common for the area around the incision line to feel numb. The surgeon will advise if a full tummy tuck or moderate tummy tuck will give the best result.