I've been in the same boat. I had surgery June 20. I never want to eat and when I do it's very little. After surgery I wasn't able to do Protein shakes milk or eggs so I have to did my protein other ways. In October I got severely dehydrated and malnourished. The admitted me to the hospital place a PICC line in my arm and sent me home to get TPN through a pump at night. While I'm on TPN I eat a little bit more but no where close to what I'm suppose to have. Few months later and a lot of test the determined nothing is wrong and we arnt sure why my body isn't absorbing. Thankfully last week all my level came up an I was taking off TPN. We will see what happens from know on. I'm forcing 30-60 grams of protein a day and about 20 ounces of Water. I'm constantly forcing myself eat something.
I have lost 100lbs but I went Nov-feb not losing anything because the TPN kept me at a plateau.
Let us know what you doctors come up with. You could have a stricture r ulcer. I have neither and I hate eating.