Phone Calls (Relatives, Interviews, Booking Appointments, etc.). How can I make them better?

Phone Calls (Relatives, Interviews, Booking Appointments, etc.). How can I make them better? This is something I've been having a really hard time with lately and would appreciate some advice on. ​ I have been seriously blocking a lot for the past few months and find it tormenting to talk on the phone unless it's with my friends. For some reason, my anxiety consumes me over making important phone calls or picking up my phone when I know the # is not my friend or family. ​ Any advice you guys have on managing blocks in calls? ​ Appreciate it.