You could tell the therapist you want to wait to go to another appointment after her vacation instead of this week. Take 3 weeks off and see how you feel. You can always cancel the three week out appointment if you feel like you don't want to go back and you have an appointment if you think you do. Therapists are not fazed by hostile letters. They do not take things personally and rarely admit to being wrong or making mistakes. They blame the client with labels.