Like you said, just telling everything to someone who doesn't know you and won't make any judgements because of their connections to the other people in your life can be very helpful. That is, I can't really tell my roommate "I have so and so issue with Meg" because she knows Meg as well, and will insert her own personal feelings about Meg into my situation. If you're talking to a counselor who knows no one involved they can give a more objective opinion.
I was pledging at the time (this was just over a few weeks) and didn't tell any sisters because I didn't realize how much they already cared about me. Had I opened up to them about the problems I was having I probably would not have gotten to the point of needing to go to a counselor to begin with. I don't know how big your chapter is or how close you feel to people, but whether you want to tell them you're in counseling is up to you. No one thought badly of me after they found out (after the fact), they just wished I would have come to them and talked it out.
Good luck hon
