The first sign my depression is getting worse is loss of my appetite. I don't even consciously know it until I try to eat and my throat refuses to swallow. It can and does get better. Get to the doc ASAP. In the meantime you should eat or drink anything you can get down. I found pudding or jello easy to get down as you don't have to chew. Milk, shakes, Ensure, anything you can swallow easily.

I hope you feel better soon