That sounds really rough, being immobilized as you say you are and having to deal with those symptoms. I hope you find more insight from people with similar experiences that you can implement in your daily life.
For me, acknowledging and recording when, how and why I feel anxious gives me ownership over the feeling. This recording tells me why I'm feeling that way, and put it into a wider context, as just one (important, challenging but not overwhelming or all-consuming) part of my life. You can journal or use smartphone apps to do it as often as you like- it can take practise. Does this sound useful?
Let us know how you are going anyway, we're here to listen and this thread has got some great responses so far.