I'm sorry to hear you are going through a rough time. Depression doesn't have any boundaries when it comes to socio-economics. Depression can hit anyone at any time.
You've already taken the first step, to acknowledge something is going on. I would suggest you see your family doctor and get a good check up, there are a multitude of reasons for depression, so you want to rule out any physical reasons as well, getting a referral to a psychiatrist might help as well. I read your other post and it sounds like you'be been through a lot of stress recently, and that could be the cause. BUT if you aren't doing basic self care like brushing your teeth, it's important that you deal with this swiftly.Slight depression doesn't stop you from doing the basics to be honest. It is very treatable and manageable, but it's best to speak with a professional. I have a great website that might help you as well, check it out.
http://www.ndmda.org/