dla application, questions

Hi,

Am applying for dla. Do I have to physically fill the form in myself. I cannot sit and write, so I'd have to do this lying down. Could look a mess and be v difficult for me.
Also, I've been v unwell for the last year, mosyly bedbound, and have little up to date ie. In the last year, written evidencc /reports of my problems. I have an xray about 2yrs old showing severe disc degeneration. Would the dla accept this?

Thank

Edit, if I have to fill in the form, I will do it of course