I was diagnosed in February and am still trying to process things too. I’m not sure where you are in the world, but if you are in the UK the MS society run a 4 week course online to help people through the this phase. I’ve just completed it and it has helped me process things and adapt my mindset.
In my opinion, when life throws a curve ball like this at you, it’s probably better to be upset now and process things than to live in denial. Hope you find a way through it.