I too also have difficulties when my therapist is away on vacation. Sometimes she writes a letter for me to have while she is away expressing that she will return and she is not abandoning me. I can also leave her voice messages and she sometimes checks them when away and will call me back if I ask her to. I told her that I don't like to do that though because I want her to have a vacation and not be worrting about work and me. She told me that she can decide for herself whether to call me or not and I don't have to take care of her or worry about intruding on her vacation time. She tells me that it is ok for me to feel needy and to ask for her reassurance about coming back. She is so kind and caring...