I wish someone had told me this before my surgery, so I figured I would share it here. For the first 2 weeks I couldn't eat/drink any dairy products and was miserable. Anything dairy burned as soon as I had it and would cause stomach problems. I found Fairlife ultra filtered milk and I was able to drink it without any problems. Even better, It has 13g of Protein per cup ( more than some protien shakes), added Calcium, and lactose free. If you are having problems with dairy or want an alternative protein source try Fairlife.
http://fairlife.com/our-products/