First of all, I agree with everyone else -- you NEED to eat. Food plays a key role in mood. I know, however, that one of the symptoms of depression is EITHER an increase OR a decrease in appetite.
I'm sorry you're having to deal with this (again). I know how hard it is. I've dealt with depression for the last 11 years of my life (I'm 25). I was on meds a couple of times, hated how they made me feel, would do better for a while, spiral downward, blah blah blah.
Honestly, the last time I had a really bad episode, it lasted for 5 months. It was HORRIBLE for me and my boyfriend. Since everyone is different, I obviously can't tell you what will work for you, but I can tell you what helps for me.
1. I take a cod liver oil capsule every day. It's supposed to help w/ depression, and I find that it probably does (I haven't done any technical studies or anything, but you know).
2. I also take a multivitamin. B vitamins, as well as D vitamins, have been found to aid in relieving anxiety and depression. This could help especially if you're not eating well.
3. Getting enough sleep. I have found this to be the #1 determining factor in how successful I am at battling my own negative thoughts.
4. Seeing a counsellor. It helps to have an objective person who KNOWS how to deal with depression, and has seen all of this before.
5. Reading a cognitive-behavioral therapy book called (cheesy though it is) "The Feeling Good Handbook" by David Burns. It's really an excellent book, and I can't tell you how much it's helped.
6. Exercise. But you probably know that already
7. Getting enough fresh air. The sun helps incredibly. I guess I must have a tinge of SAD, since I always have a rough time starting in August, until about January or February.
HTH, feel free to pm me if you want to chat.