I can relate.
My Pdoc ask me about suicidal thoughts. I hesitated for a long time and said, "No."
She responded, "What was that?"
I said nothing else. I am going to meet a new Pdoc tomorrow morning. I am so freaking nervous about it. A classmate of mine joked around about jumping off of a building with me, I was kind of tempted. How am I suppose to answer a stranger asking me about thoughts of suicide with that story?
As for medication, Welbutrin is probably got some withdrawal symptoms if you go off it abruptly. I hope you will try talking other people. Can you talk to a supervisor at the old place or talk to the new Pdoc earlier? Would you general practictioner be able to help you out with the medication until you get in to see the new Pdoc.
As for talking about talking about suicide, I hope you can get the guts to talk to your T about that. I find that my T can handle that sort of thing without flipping out and trying to stick you in a hospital. I rather enjoy having someone to share them with.