Pain under left ribs when bending
I had a pain like that on my right side (gallbladder and appendix is out). Left side according to my surgeon is where your pouch is but it shouldn't be under your rib. I found out after having exploratory surgery and nothing found except for a cyst on my ovaries that I had inflammation of my rib. Painful is what I can say when doing certain things and applying pressure helped. What I have done is reduced my excercising/lifting so it can rest and the pain can calm down. It has been almost 2 months and the pain is almost gone but I'm still resting it as different sites on the internet has said it takes at least 6 months to heal properly.
Talk to your nurse/surgeon and find out what they think. Make sure you note what you're doing when the pain happens (eating, drinking, sitting, exercising, etc) as they will want to know this and document it as you may start to see a pattern when it happens. Good luck and hope you feel better soon!