There's not much we can do....sigh!
I've lost 30lb prior to surgery and I swear, 99% of it has come from my stomach. That's left me with an overhang already - I dread to think what it's going to look like 6 months after surgery!
I have particularly dry skin. Almond oil applied to damp skin is my choice but any lotion/oil is going to make you feel better.
Ultimately, I don't know that there is anything that'll make your skin shrink. Rehydration with a lotion will probably make it look better for a while and stop it from getting too dry and itchy.