Hi Tommy! Yes, its very common to have no appetite at all after battling cancer. You will have to force yourself to take in enough. Even though you are several weeks out, you still will need to take in at least 2500 calories and 48 oz of water every single day. This is necessary to rebuild your body. Also, high protein whey powder will help you with healing. It can be found in most grocery stores or drug stores.
Here is the list Paul mentioned.
Easy to Eat Foods list Its alot about texture now, most of these foods have a smoother texture and will go down easier.
Best wishes with your continued recovery!