Anklosing Spondolists

Good afternoon ,
I must commend you on your great work.
I was wondering if you had a guide on Anklosing. Spondolists and claiming pip.my son put in a claim
A year ago but was turned down because he worked but he has had developed uvists of his eyes where he had to be off work for 2 months and now he has developed colists of his intestines and has been of work for nearly 4months these other issues have all come about because of the Ankolosing Spondolists (arthritis of the spine )these all stem from inflammation.I don’t know how long he can continue to work .I would appreciate any help as I have encouraged him to apply again.Thanking you all keep up
the good work.
Billy