Bronxgal

I probably won't be much help, but I wish you luck. Have you tried getting Protein from food? I'm not sure where you are on your eating plan, but if you can handle softs it's not a bad idea to start there.
I was in the same predicament and I spent a ton of money on different Protein drinks and bars and every single thing made me very sick. Eventually, I just ate as much greek yogurt, cottage cheese, eggs, and eventually tuna as I could. I also blended Peanut Butter, almond milk, and banana together to make my own Protein Drink that I could handle. I didn't get in the amount of protein that I was supposed to, but I did the best I could considering how little the sleeve allows you to eat.
By the way, if you like sardines (and I know most people don't) they have a ton of protein and are super small so they don't take up much space. Here's a link that might help.
http://www.howmuchprotein.com/foods/