I have upper abdominal pain, and I have an confirmed case of endo. All kinds of strange stuff can happen to your body when you have endo.
I had my gallbladder removed in July:(
It might be a stretch bilat you might have them check your gallbladder. Pain can be referred. Gb pain is usually more right upper and mid abdominal pain but it's a possibility. Just a thought. Hope you find something out!