I bet the gallbladder removal didn't help. I am sure you are following a "gallbladder removal" diet (sounds like it).

I would want to see how you do on a mostly liquid, soft (hot cereal, not thick, pureed soup) diet, if that can navigate your gut's twists and turns and prevent all those symptoms, which (just guessing) could be from a build-up at a twist and then a break-through along the lines of your x-day cycle.

Keep in mind that pea protein powder isolate and egg whites together are a complete protein (like steak). I add them to my hot cereal all the time for protein (along with Lactaid milk) as I can't eat a lot of meat or fish or any egg yolks.

For my hot cereal, I use green plantain flour. LiveKuna's brand is well-priced. and tasty. It has the right consistency for hot cereal too. It has some fiber and is an allowed FODMAP carb for me. I add a half-teaspoon of ground chia seed; I cannot tolerate the whole seed. I also add something crazy called K-Fiber from Australia (I use about 1/8 of a teaspoon).

Also try slippery elm tea (inner bark). It soothes (really well) and supports the mucosa of the gut. I use half a teaspoon, first thing in the morning, adding boiling water and drinking it like tea. A larger serving of slippery elm (inner bark) and/or more often, may help what you eat get past the twists.

And drink those soothing hot liquids. My hot drinks are mostly water. To make them, I add to 2-3 T of milk:

*a bit of powdered ginger and cinnamon or cocoa, or
*cocoa and peppermint extract, or
*cocoa and instant coffee.
*or whatever you fancy.

I also drink at least one strong cup of peppermint tea a day.

Keep me posted and if all of this doesn't work, I can't imagine the results from surgery being worse than what you are experiencing now.

I wish you the very best of good fortune.