I agree with all that has been said. You are protected, under the disability act; you also want to be treated fairly and without prejudice.
I know from personal experience that you also need to careful who you say things to. Trusted colleagues can sometimes, with best intentions let slip.
I had a promotion years ago and my line manager shared what I had said about my disabilities and difficulties. This came to light after getting a promotion. I was asked by the Head of Department to go to occupational health to see if I could manage the job. I asked if they had asked the others who were also promoted to do the same? I was told they were just trying to be supportive.
I wouldn’t have minded but I had already through the DWP had somebody in from ‘access to work’ and reasonable adjustments put in place. Guess they wouldn’t know that, but did feel personal at the time.
There are still times that those around me forget that each day is a struggle, even when it is obvious. As frustrating as that can be I feel in that moment the same as everyone else and that feels good.
At the end of the day what you disclose or not is a personal decision. As Graeme says as long as you can do the job you have been taken on far, then the rest is up to you.
See how you go, HR aware that you have a recent diagnosis, which they can’t discriminate against. Actually ‘having a disability is what is called having a protected characteristic, for which you can’t be discriminated for’. Companies these days get accreditation for being more inclusive, so you are probably ticking a box, which is a positive thing.
The other thing to say is that should your health change, it won’t come as any surprise. Only if it becomes apparent that you can’t do the role as per the job description will HR and occupational health get involved. That could be a long way down the road, so don’t worry about that.
I would as Ceri suggests have a meeting with occupational health. They are on your side, well that is my experience. In fact I have another meeting with mine on Monday.
All the best in your new job.