Hi J,
I'm sorry! This is so damn unfair and bleeding ridiculous!
It definitely makes you feel like the CRS don't believe you.
Could you see another GP and say you won't leave the office until you get an EUA, or hold a gun to his/ her head?! No, seriously, try to get another opinion..
It's very difficult as I know how hard it is to get anywhere when you're in pain.
On the depression side of things, it just destroys you mentally, I have been on ADS which have helped, not sure if you could try them just to keep you going at the moment?
You are more than welcome to PM me, I know just how you feel. Xxxx