Is it only whey based Proteins you're having issues with? I had issues with whey Protein immediately following surgery (not anymore) and I temporarily used a pea or rice based vegan protein source that worked great. You might try that and see if it helps because I'm about 8 months out and I still find it difficult to get enough protein in via food sources without supplementing some Protein powder.
That being said, there are some good lean sources of protein to include in your diet. Of course, I am not certain what stage you are in, so this would be considering you are at a point where you can consume these foods, but the best sources of protein for me have been chicken, fish and turkey with the occasional lean beef mixed in. I also juice a lot of leafy green vegetables which adds a variety of amino acids and protein as well. You can juice far more greens than you can eat, so it does add some good healthy sources of protein into your diet, as well as an entire host of Vitamins, minerals and nutrients, not to mention hydration.
If I'm going to snack, I try to snack on healthier things that will add some protein as well. Things such as low/no fat Jerky (I dehydrate my own beef/chicken/fish), nuts and seeds (raw and unsalted), hard boiled eggs, Sonoma Creamery Mr. cheese O's Snacks (you can find them on Amazon), low-fat string cheese or the light babybelle cheese snacks. I try to stick with natural "whole foods" whenever possible.
Best of luck!