I don't know if it really is paradoxalical, but doesn't it seem it?
Wanting to go to the GP because you think you might have social anxiety because you can't pick up a phone or make phone calls, you get panic attacks regularly, can't hold eye contact, unable to speak to authoritative figures, unable to meet and talk to strangers, talking to people who aren't even strangers...
But you can't because of all that....?How on earth is someone with possible social anxiety meant to attempt to get help?