Just to say, keep on hanging in there, nailit. Things will get better for you.
You are getting good advice to go and see the GP as perhaps a change in medication, either a higher dose or a different antidepressant, would help.
If you get really down, remember the Samaritans are always there to listen.
And , of course, answerbankers will always respond.
Meanwhile, try to do things that used to make you feel good/better...even if you don't feel like it.
Chin up. :-))