I had to greatly restrict my diet. Currently I am on a low fodmap diet to heal my gut. Gluten and meat really make things worse for me. I subscribed to the thrive market in order to find pea only based plant protein. I like beyond beef brand. I also was told to drink kefir by my Mayo doctor. I actually started making my own with lactose free milk. It is pretty easy to do. Lastly, your brain and gut are connected by the vagus nerve. Mindfulness, meditation, breathing are key to calm your gut down. Looking back on what you are describing, I felt so awful that I didn't even know it was nausea or my stomach. So you are way ahead of the game! Continue to listen to your body and hang in there. It gets better slowly.