Hi @Ant7,
I'm so glad you made that appointment. Yes, I know, it's difficult to get the words out sometimes, especially when It's a doctor and you feel like you are 'under examiniation' .... I think the first time is the most difficult, because it is a new experience. After a while, you get used to talking about your mental health, as though it were diabetes or asthma, or some other condition that is common.
If you like, write down a few things so that you don't forget to say them. Like, if you have any symptoms, - shaking hands, racing heart rate, insomnia (or sleeping too much), loss of appetite, difficulty finding enjoyment in things you used to enjoy, prolonged low mood that won't shift or withdrawal from social activities that you used to enjoy. These are some common things that people who are depressed experience. Your experience may be similar, or it may be different from this.... it's best to use your own words and just explain how you feel.
Thanks for asking... I am going ok. It's funny- i came home yesterday afternoon and developed a cold straight away! I think it was the stress of seeing my Dad. I just got over a cold about 10 days ago and now I seem to have a new cold. 
I am going to take it easy today and I should be around if you would like to chat.
Good luck with the doctor!