Kello, I could have written what you did not so long ago. I can remember standing in front of the fridge last christmas, looking at all these nice goodies in there, and feeling so totally overwhelmed and lacking in interest that I just closed the door. I got to the point where food was just a chore, no pleasure in it at all.
Pain is a massive appetite suppressant, as are a lot of painkillers for me (particularly codeine), but I knew deep down there was more to it than just not feeling hungry, and I had to hold my hands up in January and get some help.
I saw a dietician as a first off, and she was very helpful. We realised that I had a fairly huge mental block with food because I associated eating with nothing but pain - I'd stopped seeing it as something to be enjoyed in any way, and had more or less trained my brain to stop wanting food. The other thing I'd realised was that not eating had become habit (which kind of fits in with your compulsive over-eating theory - that's habit in lots of ways too), and I'd totally lost the ability to realise when I was hungry.
I was losing weight steadily - not huge amounts, but 2lb a week over a long period adds up, and I'd gotten very very thin. She was great, and very realistic - I was terrified she'd want me to eat millions of calories a day, but her advice was to try to increase the calories in what I did eat (add cheese, mayo, etc) where I could, and try and add in tiny snacks whenever possible. A biscuit, a little chocolate, anything that I liked, that would be gone in seconds, and that I wouldn't have to think about. She suggested keeping whatever snack food I could face in open view, so that I would think to have something whenever I walked past it. It's all fairly obvious stuff, I know, but because she was talking about incremental changes, I could deal with it. The thinking was that I'd increase my calories slightly, and by adding in slightly bigger quantities I'd increase my capacity for food (shrunken stomach doesn't help matters - I was full after about 6 bites of anything at that point).
I gave it a try, and after about a month, I weighed myself and for the first time in ages I hadn't lost weight from the previous week. It took me a further 6 weeks to gain anything, but I wasn't losing any more which was a complete result.
The biggest benefit was I noticed I functioned better mentally - again, not rocket science really - if you're starving yourself, you're not going to function all that well - but I hadn't realised quite how little in the way of nutrients I was taking in and what effect it was having on my mood, concentration, etc.
It took a significant amount of mental effort to make myself eat if I'm honest - breaking the habit of just not bothering was much much harder than I expected. Once I'd done it though, it was fine - I still don't eat big quantities, probably around half what everyone else does, but I actually enjoy food again. I still have to make a conscious effort to eat for the first time each day - frightened of pain - and I'm not sure that will ever completely go. I know I could easily go 24hours without food, and not miss it, but I wouldn't feel well.
Not sure if any of that ramble helps, but I know that when I realised I needed help I was at the stage where I felt totally stupid and abnormal - i knew I needed fuel to get well and get on with my life, so why couldn't I make myself eat?? Why did every other person I knew love food, enjoy meals and look forward to eating, when I just wanted to avoid it completely??
Hope you get your head around it - maybe it would be worth having a chat with someone? Happy to chat about it further if you want to PM me xx