It doesn't sound exactly like depression to me (although it could be). The fact that you've recognised the way you're feeling and are trying to do something about it is a very good sign.
It sounds more like you have a few too many worries on your plate, and they are starting to creep up on you in the form of anxiety. Whether you do something about it or not is up to you, and depends on whether the anxiety gets worse or not - a friend of mine was able to go to the doctor and get some pills to mellow herself, and they seemed to really help. But if you feel that you're in control, you could just work on recognising the feelings for what they are, and just working through them i.e. 'why am I feeling like this, what can I do about the situation, what can I do to help lift my mood' etc.