I think it would be useful to talk to your manager.I don't know what to do about going back to work next week. Not sure if I am ready.
We are all different so whilst some of us want a bit of normality back in our lives, others want to get their head around their diagnosis first.
You may want a bit of both so, maybe you could return on reduced hours for a week or two, if that is possible.
It also depends what your job is. Driving heavy machinery or dealing with angry customers is very different to working in an office with a group of supportive colleagues.
Take care, work out what you need mentally to manage your new diagnosis and don’t be afraid to ask for it.