Bend over backwards

To 'bend over backwards' for someone means that you do everything you possibly can to make them happy in a difficult situation.

Example:
-My pillow's too hard, the bathroom door squeaks, and the nurses come in at all hours of the night, taking my blood pressure.
-I'm sorry, Mom! I know it's no fun being in the hospital, but I have been bending over backwards to make this as tolerable as possible. Tomorrow I'll bring your pillow from home and some WD-40 for the door.