Hi Saffie - so sorry to hear of your husband's diagnosis. You are bound to be in a state of shock especially if you weren't expecting it. Your lives are changed and you will have a lot to face later on but you will settle into and adapt to your changed circumstances.
What the hell is next for you is difficult to answer - everyone is different.
It is about 3 years since my husband was diagnosed - he has Alzheimers, and we are still able to go on holiday, visit friends and play golf together however we cannot have a conversation mainly because he does not listen.
In a way, at least in the early stages it can be worse for the partner, my husband, like yours, just doesn't acknowledge his condition..
This would be my advice to any carer in the early stages based on what helps me
Look after yourself as much as him - it is in both your interests.
Maintain or develop activities on your own if you possibly can, if possible have a separate place within the home to sit and relax as well - while you may not need this now I believe it will be better for you later on if he is used to spend some time alone. I would even go so far as thinking about sleeping separately on one or two days a week if possible.
Learn to tell fibs - make your lives as easy as you can by giving him reasons he will accept when you are suggesting things eg I need to sleep in the other bed because I can't sleep and want to read without disturbing you.
Get help from relatives, carers/companions if you can afford them or can find a charity that offers befrienders in your area. Again you may not need them at this stage but if your husband is used to having others help him he will hopefully accept help easier later on when he will need it.
Get Power of Attorney sorted out while he still has capacity - I did it for both of us with him and and my son acting as Attorney for me saying it was sensible as we were getting older. If you are ok with form filling it is not difficult to do it on line saving solicitor's costs.
Look for dementia groups in your area and use this forum to ask any questions - you will get good advice. Maybe don't read other posts for now - you don't need to be worrying about future problems at this stage.
Deal with changes as they arrive - don't look ahead too much.
To end on a brighter note I have found that by far the majority of people, young and old, strangers and friends are very kind when they know the situation.
My best wishes to you - you will deal with this awful illness because you have no choice - focus on enjoying life as much as you can rather than worrying about what is to come - easier said than done of course but you might as well try. Good luck