it is just going to take a few weeks for the pain to calm down after the surgery (which can be true), rather than another cause going on (which only a second opinion--perhaps from a gastroenterologist) might resolve...
So assuming the above, then the ongoing pain is the focus. Chronic pain, including abdominal pain, can trigger a feedback loop. That means that even after the immediate source of pain is removed or reduced, the brain and central nervous system can continue to receive and feed back pain messages in a continuous loop. So, the brain perceives pain because it is "used to receiving those messages" and therefore you feel pain. Now, pain has positive purposes (to alert you that something is or continues to be wrong, needing attention) but when these feedback loops are activated, then the pain needs to be addressed. But, typical local pain medications, including anti-inflammatories are not going to address the feedback loop, seemingly "stuck." In this case your overseeing physician, whether your primary care or your surgeon can either try a drug that is specific to this upper-level "perception of pain" (like gabapentin or amantadine as examples). Or they could refer you to a pain clinic. But, if there is an ongoing cause for the pain outside of the "stuck" perceptual mechanism then these drugs may not help. A pain clinic might offer other alternatives so if all are convinced the primary cause has been addressed then that might be a good referral.
I think this is at least worth a discussion with your surgeon/primary care--especially if a second opinion has rendered an opinion in agreement that no other cause for your continued left-sided abdominal pain exists.
I'm sorry you are going through this and have to become your own best advocate. Our medical system is far too obstacle-filled for many of these kinds of issues.
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