Deep breaths, Lily.
You have been through a LOT emotionally and physically. If you need your mother to come earlier, call her.

That pain may be stitches or "moved" tissue. But let the doctor know about it. If it becomes worse today, call the doctor. Don't wait.
When I turned a certain way, I had a sharp pain from scar tissue that continued for two years. But don't take any chances on ripped stitches or infections.

I am amazed that you are up to getting dressed and going to lunch. Go easy girl! Your body has been hit by a Mack truck. Jittery is normal -
you are recovering from a life threatening surgery.

Let us know when Mom arrives. OK?