I got PIP for Fibro, though I also have mental health problems too. But I got both rates. Yes, I decided to do a few questions per day, in rough first, then copied them out. If you can photocopy the blank form then write in pencil on it and copy it onto the main form bit by bit when you're happy with it. You'll be glad you kept a copy when it next comes to filling it out. All the best
