I know fish is great protein and low fat. Turkey is better than chicken. You could also try protein shakes as meal substitutes for when you don't have the time, but clear that with the doctor first. If you are allowed the protein shakes make sure you look at the contents closely. I was drinking them for a while, and found some had better percentages than others.

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"BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Will he offer me his mouth? BOY: Yes. GIRL: Will he offer me his teeth? BOY: Yes. GIRL: Will he offer me his jaws? BOY: Yes. GIRL: Will he offer me his hunger? BOY: Yes. GIRL: Again, will he offer me his hunger? BOY: Yes! GIRL: Yes. BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Yes. BOY: I bet you say that to all the boys!" -Meatloaf