Well, PIP nails you down as being from the UK. It's a nightmare benefit to claim. I have a friend who took 18 months to successfully appeal her adopted daughter's PIP claim - eventually she won, but not without having a nervous breakdown over the stress and worry. Have you been to your local citizen's advice bureau? Another woman told me that when her PIP was rejected, CIB did all the legwork for her and she successfully won her appeal. I suspect she got very lucky, but even so... Look into CIB, MIND, and any other local mental health charities you can find to help you with filling in forms for benefit claims.
There's also this site. You have to pay £20 to join, but it looks like a decent resource: /www.benefitsandwork.co.uk/
Good luck and I really hope you can get some much-needed help. It's absolutely disgraceful the way the most vulnerable of our society are now being treated, but that's another issue. You can only work with what there is, which is becoming increasingly less.
Dx Crohn's in June 2000. (Yay )
Tried: 5-ASAs, azathioprine, 6MP, Remicade, methotrexate, Humira, diets.
1st surgery 20/2/13 - subtotal colectomy with end ileostomy.
2nd surgery 10/7/15 - ileorectal anastomosis. Stoma reversed and ileum connected to the rectum.
Current status: Chronic flare. Do I have any other kind?
Current meds: 50mg 6MP; Entyvio (started 3/11/16)