Why aren't you able to see your therapist? I hope you keep trying because you really NEED to see him. And when you do PLEASE make sure you tell him about this feeling of wanting to end it all.
There have been times when I'm driving on the highway that I too want to drive my car into the bridge abutment, but of course I don't do it. That's cause I usually have someone with me, and I certainly wouldn't take someone else with me if I did it. I don't seriously want to commit suicide. It's just one of those "things" that cross your mind. I have severe clinical depression, and I'm medicated -- and even tho most of the time I feel pretty good, there still are times the meds don't work that well.
Please -- try to get in to see your therapist. You really need to. God bless and please take care. Hugs, Lee