Does your primary care provider know that you are attending a clinic? It shouldn't matter I know but I ask because it may be easier for you if he could write a letter to the clinic on your behalf. It's not just you and it's not just your clinic, a lot of other patients are having to go through the same thing.
The clinic gets scared at times like this and their first thought is to cover their own a**
I had already posted to your other post before seeing this and so the response is pretty much the same.
Please keep us posted on how it goes. And above all, please don't give up. Having your life back to normal is worth fighting for