I had posted this a while ago but I know there are new people here so I'm adding it again to help:
If you have FND and drive... you NEED to inform dvla
Although their website doesn't list FND you still need to inform them of your own personal symptoms and then the process begins.
They will want details of what happens to you. I have been through this and according to them I was first case they had dealt with which I found hard to believe. This was August 2015 and it took 9 months to eventually get the ok from them.
They sent me on a driving assessment to test my capabilities and responses etc
Please please do this! It's vital you don't ignore it
Even if your consultant from neurology has said yes you can drive then put that on the form: they will contact him/her to confirm this.
We know each FND case is different symptoms wise so this is why you need to tell them , even more so if you have had even 1 black out or drop attack.! Thankfully I've had neither.!
I hope this helps.
Any queries let me know and I'll do my best to help