What anti depressants are you taking, some of them like amitryptaline or mirtazapine might improve your sleep. I've been considering mirtazapine for a while now for my poor sleep.

The NHS moves at a glacial rate, I think they hope you will recover while waiting. I reckon you did the right thing going for the job interview, it's easy to start blaming things on PCS when they might have turned out the same anyway. I would make sure you don't get stressed, do some light exercise each day, eat a good diet, take vitamins and wait for your brain to repair which it will do in its own time and no one elses.