Just be completely honest. Even say, I'm nervous to tell you this. Try to think of it as a bubble, a short time and space to get everything out. You won't deal with everything that's said at once, but it will help them match you with the best people to help you. If you're suffering, you don't want to be forced to work with a "babysitter" therapist. Tell the truth and they'll get you the real help you need.