Perhaps you can call the counselors back and try to rebook the appointments. I'm sure you aren't the first person to cancel! Perhaps at least give it a try.
Yes, you do need to see a doctor, you're right, I also get that your phobia holds you back. Do whatever you can though, even try to get to a walk in clinic.
I hope you don't judge your Son too harshly, not everyone understands mental challenges, just like not everyone understands alcoholism.