Go back to your surgeon & demand, if you have to, help. There must be a reason for your pain. Ask for an ultra sound, X-ray, &/or a scope. Some pain is to be expected after surgery but not four weeks out. The odd twinge, yes, but not pain like you’re describing.
Gas pain is usually gone or almost fully gone after a week. Surgical gas rises so it can escape through the lungs. It settles behind the lungs & puts pressure on the phrenic nerve causing shoulder pain.
Some people talk about an occasional shooting abdominal pain which is often caused by internal sutures or muscles pulls & strains.
I’m wondering blockage, gall stone, …. Excess stomach acid can cause sharp cutting pain - are you on a prescription PPI?
Hope you get an answer soon.
Don’t worry too much if you’re not exactly meeting goals to begin. As long as you’re close you’ll be okay. It can be a struggle at first but your pain will be hindering your ability to reach goal as well.