Depressed

So lately the days have been very hard for me and I'm not sure when it started but I don't like it and I don't know how to get out of it. It's really hard for me to get out of bed, sometimes I don't eat or if I do I over eat. A lot. And I don't ever want to leave my room. I just want to be alone all the time. There are many factors to me slipping back into depression. I really want to do something about it since I'm starting to feel really terrible and not care about anything or anyone especially myself. I don't know if I just really need someone to listen to me or what but I hate this feeling and I want it to go away.