I count myself as disabled as I have two ongoing illnesses. One is mental health. I've had three weeks absence just now for both illnesses which have flared up. My work ethic and attendance is usually excellent apart from a period of 13 days last year when I was off with mental health. When I disclosed my anxieties about being off work this long this time to my boss he told me he has absolutely no issues with me taking time out to recover, that he wants to me take the time to recover to full health and come back only when I'm ready.
I have been wondering about formally logging my illnesses as disabilities with my employer, but I'm not sure if this is necessary. I guess for my protection. My employers are very lenient. I can spend 20 mins in the bathroom in the office if I'm having a flare up from my illness and no one bats an eyelid, so I'm not sure what I want from it really.