Tanser - if I were you I would write down exactly what you want to say and go and give it to the appropriate person, but wait while they read it. Explain to them that you are worried your emotions will overcome you if you try and explain it verbally. Hopefully, that will open the floor for you to have a rational conversation with them. And don't be afraid of showing a bit of emotion (just try not to lose your temper)!
Put everything in writing - how upset it is making you feel, how you are scared, and as many of the specific incidents as possible.
Good luck - take care of yourself
EDIT: Dammit - jumped straight to reply, after reading Tanser's post. Didn't realise it had all been sorted out.
Come back Tans - we miss you!!