As a person that's dealt with severe depression my entire life, I find there are two distinct ways to go about it. First, and more simple, is dealing with exterior issues that may be causing the depression: daily routine, poor sleep, bad eating habits, social patterns, lonliness, etc. If you take a moment to really examine the patterns you've built around yourself, it can be very easy to notice what needs fixing, and even if it's a small adjustment in the things you do, it can make a huge difference. You say you are very stressed, perhaps you can start there. Try to figure out what are the factors that are causing the stress/anxiety, and maybe approach them differently. Try to separate "stressors" from each other and confront them one at a time whenever possible, as not to feel overwhelmed. Secondly, the more complicated issue is: dealing with interior issues. By which I mean, maybe there are deeper emotional problems that you are having trouble dealing with and are causing you pain. If you can somehow find a means to begin dealing with these things, that will certainly help. If you can, try seeking help from a quality therapist, or if you are religious, you can find comfort there,or it may be as simple as having a strong network of family and friends to confide in. Or, ideally, any mixture of the three. Also, you may have a chemical imbalance that can be adjust with the help of medication, of course that is a big step to take and only a Dr. can help you make it and steer you in the right direction. Good luck to you, and please know that no matter how bad it may seem, you can indeed fight it and get better.