We used citizens advice, but if you can afford a solicitor or in a union, or a charity that can help represent you on what is going on. A doctor/specialist report and hopefully you have kept list of appointments, treatments, hospital tests and anything you can bring to the appeal.
We received a really good outcome, because of my wife's circumstances, being disabled.
She does not need to be assessed again and a court order to prevent the authorities to get one!
This was obviously around a decade ago.
Good luck!
When asked questions, impress the difficulties you are having, stress the symptoms and treatment you need.
These tribunals know the score and if you have been honest and under scored, they will almost certainly adjust the score higher for your claims.