Haggis - please tell your DH from me that it doesn't matter how fab your life is, if you have depression you will feel bad. It's nothing to do with what the common use of the word "depressed" means (i.e. a bit cheesed off or fed up with something in particular or even life in general), it is an imbalance of the hormones and brain chemicals where the "happy" and "coping" chemicals are at a lower level than normal (depressed). Rationality doesn't come into it!
Anyway, rant over - it just really pees me off the way people mis-use the term as it trivialises the hell that depressives can go through (and I live with one, so I know).
I also agree with Snot and Grace - there must be one friend you can talk to? Most people will be understanding even if they've not had personal experience of the condition.
And don't be ashamed of being on tablets - after all, if you had diabetes you wouldn't be ashamed of being on insulin, would you? There's no difference with ADs, you are just replacing a different hormone.
I still think a good chat to the doctor about the tablets and how you are doing on them would be a good idea, but you must explain exactly what's happened in the last year (bereavement etc) as this will give him the complete picture.
I hope you're feeling a bit better now you've got it out in the open, at least on MN!, and that there are people here who want to help and who will listen without judging you.
Best of luck with the GP.