Instead, call after hours. Leave a message and wait; someone will call back the next day. If you feel calm enough, you can pick up then, but if not, you can let them leave you a message in turn. Eventually, after enough messages have been left, you will have warmed up to the idea of talking on the telephone, and an appointment can finally be scheduled.
This is inefficient but safe, and I greatly prefer it. In my old age I have given up making first moves; I simply will not do it. I will only indicate to the world that I am ready to be solicited.