My T tells me a while before she is going to have to cancel session (unless she is sick or something). Then we talk about it before she is gone. Last time we planned what i was going to do during my therapy time. It helped to have a plan. That way I knew what was happening.

It is not unusual for people to have reactions to their Ts being gone. Ts know this and it is important for them to talk this over with them. Most (but not all) will talk about it with their clients.