I have been avoiding doing the form for a couple of weeks but yesterday after a bad few days I wrote in the bit where it asks how your illness affects you "I am useless. I cannot do anything. I cannot even fill out this wretched form. I just want to die" and sent it off 

What will they do? Will they just ignore it and ask for a properly completed one or will they just refuse my claim for not providing the information that have asked for?