PIP review

Hi i have just received my 2 year PIP review and read through it. I have stenosing of the lower spine and upper/neck area which means i have times when i can't feel parts of my body. Legs, tummy, lower regions and on the upper neck/shoulder, intense pins and needles all the time, locking of neck at times and numbness of triceps and no feeling in fingers, forearms. Back spasms that can last several hours that leave me unable to move. I have the support of my doctor, MRI scans showing stenosing etc. I found the form rather daunting and I'm on the lowest tier because of incontinence caused by stenosing it think. I live on my own so manage as best i can. Any help advice on how to fill the form in would be much appreciated and if there are links you could share id really appreciate it, i have to send the form off tomorrow.