You just had major surgery. It takes months to completely recover. Fatigue is not unusual, and maybe the depression is caused by that. It's pretty boring going through the limited diet at first and building back up slowly. It took me 8 months to really feel better, but I am a senior.
If depression is serious get help!
Do you by any chance have a bit of anemia? You may have to ask the doc about
Tell the doc about
the throat feeling. I get some mucus sitting in the same place. It's probably nothing important and will lessen with time.