Just to add my voice, for what it's worth, to the others.
Depression can be treated. It shouldn't be a reason to stop your transision process, unless they suspect that the process is the cause of your depression.
And, Don't mention suicide. I say this because if you were really suicidal, you wouldn't be here. Thinking about jacking it all in, feeling completely hopeless, even thinking that being dead would be better than this is not really suicide. But some junior Dr, with little experience, might get the wrong idea.
I once attended a lecture on impulsive behaviour. They talked about how we all have thoughts of jumping off buildings, hitting people for no reason, smashing something and such. Sorry, but we all think about these things occasionally. We all have really silly thoughts sometimes. But we control them.
In the mean time, you could try to sit down and think about why you feel so hopeless.