Oh my lovely... I have been living with arthritis for the last 30+ years (diagnosed shockingly early in life). I've worked full time all the way through, dealing with disabling bad back while running a business, taking codeine every 4 hours when it was really bad. Running a multi million pound business while in serious pain, never used it for a poor me give me a break situation.
We are all *different*, we all react to pain and stuff in a different way and that's ok - I would never, ever judge because I am me, and cannot speak for anybody else.
However - Jack can go to the absolute duck. If she's truly disabled, fair enough. Apply for the relevant help and SHUT.THE.duck.UP about how ouchy you are. Don't use it as an excuse, mate, it doesn't wash. There are plenty more people out there in real situations that need help, and try to get on the best they can.
Sorry, but this truly makes me see red. Cheating, lying, tricksy, false, grifting, despicable tosser.