As a person who has anxiety disorder (and is actively treating it), I would encourage you to change your language regarding your situation.
First, you've always been anxious. Okay. Low-level anxiety and you were managing it. Now it is exacerbated (or triggered) by this new situation. The situation is not the cause; the anxiety was already present. The situation is a trigger for an amplified anxiety.
It's sort of like saying "this plant grew from love". No, it didn't. The plant was a plant first and love, care and watering were what made it a better, stronger plant. I think examining our language around our feelings is important if we are going to bring the feelings and thoughts into perspective.
This may be a time when a counselor and/or short-term medication might be helpful. A couple years ago, my son was in first grade and being routinely physically hurt by a classmate. The frustration, anger and helplessness in that situation *exacerbated* my anxiety. My thoughts/feelings/brain were more or less hijacked and on high alert. So, along with seeking counsel from mentors (who advised me wisely) and a counselor, I also decided to talk to my doctor about a prescription as a temporary measure. While I chose to stay on this (and really, I had no idea how much anxiety had been affecting my life and behavior until I got a break from it, and I love being in control of my own head now), this has helped me through my own concerns and understanding of my own special need kid. (He has ADD and some significant processing delays; we have transitioned him to home schooling where he is actually learning now, in a way which really works for him.) I'm unsure what the last two plus years of our journey would have been like without help and support from mentors, a good counselor (occasionally, but still, valuable) and relief from that faulty brain chemistry of mine.
So, I would encourage you to seek outside help. I can tell by the tone of your many posts that this anxiety is producing a lot of worries for you. Your son needs you to be an even-keel and is likely sensing your anxiety over his future. I don't want to be unkind, but for kids, that comes across as a no-confidence vote. You really don't want to send that message. As someone who has experienced the transition from being a more white-knuckled mom to someone who has confidence that her own funny little learner is going to be just fine, I really hope you are able to find freedom. Good luck.