33 Yr Old Tummy Tuck with Lipo, Breast Reduction/breast Lift - Omaha, NE

With the breast lift, tummy tuck and lipo I'm afraid by laying on my back so much it might flatten my butt. Is this true or not? Do I need a donut or something under me??

Tummy tuck, breast lift, lipo in my back and hips done.
Everything looks great. My nurse Erinwas awesome. Dr. Bruneteau was great.
I love my results.
I'm just so out of it right now from the medicine.
Everything hurts really bad. It hurts to just move. :(

I went to my pre op this past Friday and my iron is low.
What are some things you did or used to get your iron up? Besides iron pills. I have been taking them prior to my appointment so I'm not sure why it was low.