Gallbladder removed 2 months ago. Sometimes have abd pain when laying on my left side. Why?

Pain after surgery. You have a scar in your abdomen. It's not uncommon to have some post surgical pain for months to a year when the scar is tugged, pressed, or stretched by the shifting of internal organs with certain movements. If it is very uncomfortable or worrisome please consult your surgeon.
Still healing. Could be referred pain...Ilove acupuncture and chinese medicine and would highly suggest seeing one as that can really help you with the pain and overall recovery form the surgery. Feel better!