Help with possible depression?

For the past 9 months (since about christmas) I have just felt so empty and numb. About 3 months ago I went away for a week and came home to discover my partner of 5 years had taken most of the furniture and about $20,000 and the car and left me, the silly thing is that this did not upset me, now I dont have to pretend to be happy or normal at home. The smallest things make me cry, I just wish I could go to sleep and never wake up. All I do is sit in front of the TV in a "not really watching anything" sort of a daze and sleep. I have been eating barely anything and lost about 10 kgs in the past 3 months (a lot of the people at work have commented that I have lost a lot of weight in the past few months, one person even pulled me aside and asked if was sick). I thought I was just normal until I was driving home and listening to the radio and the announcer was talking to someone about depression and a book he had written about it, from what the author was saying it sounded like I was depressed. Every day just sort of melts into the same thing, get up, go to work, work, come home, sit around, go to bed. I am not happy, I couldn't be bothered doing anything I enjoy. I feel if I do go to my GP he will just tell to harden up and get over it. I feel tired all the time but I cant sleep, I take phenergan to get to sleep but just wake up after a few hours and lie there in bed. How would I approach a GP to get help because if this is going to keep going on I dont know how I will cope.