Pip Application Form

I received sms from DWP sent the form and that I need to return it before the date givent. I am worried how to to fill in / supporting evidence it is very hard for me to concentrate . I have many health problems ,I am being seen by neurologists for the last 5 years for my debilitating Trigeminal nerve pain it starts from my left eye spreading to left side of head it is triggered by concentrating , reading ,I can not read , I can not watch TV . it can also be triggered by noise, lights , weather changes , so unpreditable I can do nothing with the pain /headaches. I have very dry eyes need drops every 2 hours every day yet cannot open eyes in morning before being helped to wash them and start my day , I have a multi vessel heart disease diagnosed 2015, artheritis in both hands back , shoulders , many problems weak muscles weak bones over the years had a surgical premature menopause at age 33 . I do need help for many daily activities cannot travel alone because of anxiety , loss of concentration etc . I visited age concern for advice on what to do bogged down by a sickening noise from a huge construction started in front of our privately rented home making me virtually homeless all day as I can not return home in this crippling noise, if I have to -
But they gave me a number to call / request a PIP form!!! it is on its way now . I cannot read any lengthy guides shall have an attack of Nerve pain , my husband does the reading for me but he is very depressed on thoughts of applying disability ! , it looks very difficult may be only disgusting and most ppl dont get it in the end ?