You just had surgery, so it is normal to feel a little nauseated, sore, and have the gas pains in strange places (like your shoulders). Did your surgeon prescribe anything for pain? Sometimes the narcotic pain meds can nauseate people, so maybe try taking liquid tylenol instead. Keep sipping small amounts of fluids and rest up. Your body needs rest to heal, but getting up and walking a little will help with the gas pains. I also used a heating pad on my back and it helped me greatly.
I have had a lot of hunger-like pangs since my surgery last Friday, and it is more intense than any hunger feeling I've ever had before. The last few days have been better though, so maybe it was gas rumbling through my stomach.
Try checking out GNC or a local health food store for products that are clear liquid, but contain whey isolate Protein in them. I have been using Isopure, which has 40 g of protein per serving.
Best to you! You'll get through this. Take good care of yourself!!!