In my opinion I feel that sometimes depression is a choice. We can either choose to be depressed or give a damn and live our lives. At this point I dont think medication is advisable. Like most sugestion take a day or two off from work and do what you thought you would do if you would only be free while working. Don't worry about the money you lost by not working, think about the future medication money you saved by taking a break. Get drunk to you head and if you have a chance of one night have it lol. And the most important is talk to your family , just talk about anything , tell them you love them, may be you never told them how much you miss them ..it will make you feel good, and go with a positive attitude to work.

Cheers man