I think its fine to call your T. I have called and emailed my T with something I needed to ask before we had a session. Its also perfectly normal to not want to go to a session because you are scared. I was scared and didn't want to go to my last session and I emailed my T and told her that. I did end up going and it was one of the best sessions to date. My T also told me she was so happy I emailed her and let her know I didn't want to go because I was scared. She said it really helped her to understand.