I know how you feel, I could not sleep the nights before I had therapy, especialy the first times.
I felt like my legs were rubber walking into the clinic, I stumbled over my words and filled out the 10 pages of infor with shaking hand and trying to hold back the tears in my eyes.
Then I am sitting in a room with a perfectly nice stranger who takes my info and then asks tell me how you are now.
I wanted to scream "crazy" I am here aren't I but instead I sad there and cried. She was very good and led me along with simple questions. In the end I liked it and felt much better.
Take care and just do it.