Not uncommon at all to not be hungry for some time following surgery. Nothing to worry about.
Not getting your Protein - that's a different story. You might try getting some unflavored Protein powder. First thing in the morning, put a scoop of the powder in a small bowl. Depending on the powder, one scoop is 20g or more of protein. When you eat or drink something, put a pinch of the protein powder in. You can add it to almost anything and if it's just a pinch, you shouldn't notice the taste too much. By the end of the day you've eaten an additional 20g of protein, a pinch at a time.
I sometimes wonder if doctors and others in their offices do a good job of helping folks understand the importance of protein. Unlike fats or starches, your body cannot store protein. Amino acids are the building blocks of protein and the nine "essential amino acids" must be obtained from food - they are essential because your body cannot manufacture them. That means they have to be replenished. Every day. Carbs are king when it comes to energy but when you're on a low carb diet, your body will use protein for energy instead. Every cell in your body contains protein. Remove all of the Water in your body and 75% of what's left is - protein. Protein is critically important in the healing process following surgery. Protein is a key player in helping the body fight off bacterial and viral infections. Protein will help minimize muscle loss during rapid weight loss and will also help reduce hair loss to a minimum. Try anything you can think of until you're getting ALL of your protein in, every day. You'll be glad you did!
You're gonna love the new you!!