pip tribunal

hi i have a filled in an SSCS1 form to attend a tribunal after being refused pip for my autistic son who also has phobic panic disorder. he was getting the higher amounts of dLL. we did go to the medical but because of the hard work and bribery i had done with my son , apart from refusing to speak at first without coaxing from me,he answerd there questions just saying yes to all, because he was saying what he thinks they want to hear. so now the cab have helped me by wrting a letter but that didnt work. i was gobsmacked that he had been awarded the same 4 points on mobility and 2 for personal care which isnt enough points to qualify. my son doesnt go out of the house at all without me or his dad. he needs to be watched at all times. he panics and is actually sick at the thought of going anywhere new or familiar. i have decided that if i cant get him to go to the tribunal,that if its clearly causing him distress, that i shall go on my own. i do have power of attorney to speak for my son. the trouble is that iv been ill recently and now i find that due to my illness i cant deal with things the same as i used to. my speech isnt as fluent, i forget words and what i want to say. its taken me ages to write this. i was wondering if it would be best to take someone with me, but i dont know who. maybe i should hire a solicitor. im not sure whether that may be a good idea or not . i need guidance. thankyou