Stomach ache after I eat...always
Just reduce your amounts until you find a comfortable volume that doesn't make you feel sick. You shouldn't still be eating after 45 mins just because you feel you need to get it all in. I was doing that too until I talked to my NUT about it and told her I couldn't eat that much. She was fine with me eating less.
Don't get stressed about the protein thing, especially this early out. Just get as much in as you can without hurting yourself. It will slowly increase as you get further out and get your food/fluid/protein ratios sorted more comfortably.
I agree that it may just be too much food. I was feeling that way, too. I was drinking fine while I was on liquids. When I added soft foods to my diet, everything got so much harder. I finally pulled back and went back to mostly liquids with just a meal or two of soft foods (I eat 5 small meals a day), and about half or even less of what I'd been trying to eat before. Now I eat about a tablespoon or two of food instead of an ounce or two. I feel SO much better. My stomach obviously wants to take things slower than my "plan" said I could. I get a lot of my protein from Isopure drinks. Taste is not so good, but it's good for me, so I've learned to ignore the funky taste. I think it is important for you to be getting in your protein, IMHO. Experiment until you find what works for YOU. I think this is all just so individual for each of us.
Jane