I won't suggest that this is a simple fix I don't have this problem...but my problem also might be yours ...

the nerves in my stomach (or wherever the sensors for feeling hungry or full are) are all messed up. I know this. I don't have good nerve signals in the rest of my body either.

I have to debate just what my body needs ... because I don't really feel "good" in my stomach at all, ever! I KNOW it can't be hunger if I've just eaten (and if I don't recognize this, I'll eat til the cows come home!) I just have to evaluate and not assume that I'm hungry, or full, or that I've eaten too much, or not enough, or that my stomach's upset...

Maybe you can work through some of your ill feelings about having eaten too much (when your brain knows you haven't) and blame it on nerves that aren't telling you the right thing? Have I been clear in what I'm trying to suggest?

I hope so.