Listening now and it's leaving a bad taste in my mouth as to how parallel this is to my own personal situation.
In the 3 attempts I've made to attain disability benefit (ESA and then PIP twice), I've been awarded zero points for all components of their "investigation"; their reasoning being that I didn't have any physical or mental impairments. I remember being so shocked because I never expected the DWP to so confidently lie about my health condition. It went absolutely in the face of how my meeting went (what was discussed etc.) and my clear medical and employment histories. I even tried to appeal once, and sent in a lot more information but they didn't even acknowledge the new evidence. I don't know how you can fight against that?
I honestly they think they graded me, if I was even objectively graded at all, on whether I could make a short walk down a corridor and could gently push against the "medical professionals" hand... Cause', you know, that's a great test for a fluctuating health condition.
I didn't even go to my fourth attempt at applying for disability benefit because, 2 months after I submitted my PIP forms, they invited me to a meeting at a technology park outside of town where there's no public transport link.
You know what they say, fifth times the charm.
On a side note, the power should be in your regular doctors/specialists hands on whether you should receive the benefit. Give them the tools and the powers to make the decisions and hold them accountable. Surely that's what they're trained to be doing?
and gambling. 
