I'm exactly the same! I put off making a very important doctors appointment because I forgot to tell my doctor to automatically set my next one up. I was supposed to go 3 months ago... I just put it off and do other things and pretend I forgot.

What helps me is thinking about what might happen if I don't call, then I act! Pretending your good at making phone calls sometimes tricks your brain into thinking you really are.

Take deep breaths and remember it's only for a few minutes.