Job

No I wouldn't have it on my CV. It only needs to be mentioned if it would affect your ability to carry out the set tasks. Once you're further on in the process is when I would bring it up

Take it off, people will see it and disregard you immeadiately because they wont understand the numbers and think you will be more effort. you can disclose when asked or on acceptance of the job. (or later!)

Diabetes has no place on a CV. You want to portray a positive image right from the start as your CV is the first and only thing a potential employer can initially judge you on. There are certain professions that need to know about diabetes but there are already procedures in place for this to happen. Your medical record is confidential. If they don't need to know, you don't have to tell them. Many people like their work colleagues to know but personal preference.
The job description should give guidance on what medical conditions you need to declare. Also, if driving company vehicles, you may have to inform them. Good luck !
Mo

Honestly it doesn't matter - I wasn't asked by my employer but told them after 3 months after my DSN advised me to - hasn't affected my ability to do my job and it's had very little impact on what I do even though it's a very stressful job, my work colleagues are fine with me testing and injecting and it's never raised any problems.

Good luck with your job search and keep positive