I'm sorry to hear about the dilema that you're in.

Whilst you may not necessarily have to be in the front line at work dealing direct with customers, you will, somehow or other be liaising with others through some means of way.

I had a quick look for some Blogs here if you want to have a read through them:

7 Ways to Overcome Shyness and Social Anxiety | World of Psychology

http://psychcentral.com/lib/4-psycho...ocial-anxiety/

Going to Work With Social Anxiety Disorder