Hi Paul,
Im sorry to hear you are suffering from depression. Im not sure I can really relate as you say you have had depression in the past, but right after surgery I felt very tired and I knew something was wrong. I would call my doctor everyday and tell him I wasn't feeling well. He said it was all part of the process. I felt tired all the time and couldn't keep anything down. I was invted to several partys and just didn't attend as I knew everyone would be eating and having fun. Yes I concidering eating fun. Well 3 weeks post op I landed in the ER I had internal Bleeding and was dieing. I had ulcers. I was in the hospital for 3 weeks after that. My suggestion to you is to always listen to your body. If you know and feel something is wrong talk to you doctor don't be afraid or ashamed in any way. As far as what replaces food after I got well, I started walking, keeping a journal of how much I have lost in inches and in pounds. I still have issues when ever I am invited to partys or potlucks at work. But I try to always ask the host at partys if It is ok for me to bring a dish. A dish that I know I can eat. Take walks, talk to people , read books, dance, learn a new language, Anything to help you though this . Belive me it gets better every single day. You will be ok!