I'm telling ya, it ripped me up bad. I had a big slew of pills from my reversal surgeon, was taking antibiotics as many do post surgery, ended up taking 3+ weeks worth of antibiotics because I had no choice. I was on a low dose of meloxicam (NSAID), was taking tramadol, and it didn't take long to realize what was happening to me. My guts were shot.
I wasn't taking opiates, and never have, but they are hard on your gut too. I was talking probiotics, taking something to help me crap, and doing everything you probably are.
It caught up with me eventually. I had no choice but to only take what I had to. It took months to get my GI straightened out.
As has been said already, your GI is key to your health, and healing. I actually have worse testicular, and lower back pain when my GI isn't right. Letting myself get to hungry, low blood sugar, etc can cause me more pain to.
Did you ramp up on any pre surgery vitamins such as A, and C like I had suggested?