I'm sorry to hear you're not well and hope you're able to have the surgery quick smart.
Being the time of year that it is, perhaps some simple salads with cold meat like sliced turkey breast from the deli and lean beef steak.
Also, some stir fries should be OK since you can use little to do oil if need be.
I use Kikkoman brand marinades, especially Teriyaki to marinade sliced rump steak and chicken for stir fries and chicken fillets for grilling. It really is yummy for something so simple.
There is lots of recipes here:
http://www.kikkoman.com.au/index.php...subproductid=3
Grilled fish fillets would keep the fat intake low, too.