I don't have that exact feeling, but maybe it's similar. When I'm hungry, I start getting a headache and feel depressed, sometimes even suicidally so. However, I recognize that when it happens, I can probably eat something and be okay - however, that makes me distrust my sadness or anger as authentic because I end up assuming they're just hunger.
I used to have an eating disorder because I got kind of mixed up and thought I could condition myself against depression if I stopped eating - not so. I think the problem may be worse now.
But, as many times as people say this, I think staying hydrated helps. It kind of regulates my physiological hunger so I can define whether it's that or my emotions a bit better.