I understand your situation , my DH was diognosed in March . He refuses to use the word 'Alzheimers ' but is taking medication. Understandably he does not want anyone to know and that includes our AC. Dementia is so much more than memory loss, it is lack of judgement, poor decision making, change in personality, refusing some foods that have previously been enjoyed, not recognizing some people ( at times,) in addition to that the usual losing things , forgetting appointments..... and so it goes on. My DH lives in the moment, does' nt think of consequences and seems perfectly happy!! The Alzheimer's Society are there for you regardless of whether your DH will engage with them . We are in the early stages as and it is already difficult!
Do seek help and if possible continue your interests, keep in contact with your friends and don't feel guilty about taking yourself off for a walk or a shopping trip - treat yourself to a lovely lunch too. I try hard not to be impatient with him , I am not cross with my DH just sad and anxious about what the future will hold. When my Mum had dementia it was hard but I had my DH beside me, when she died I was devastated but my life picked up and went on as before .A DH with dementia is a different kettle if fish altogether, when the dementia progresses my life will never be the same again - I will be alone. For now we are managing and I take one day at a time, I hope you do too. Speak to your GP tell him / her your fears.
Have you a LPA ? If not I strongly advise you get one , I pressed for this prior to diognosis but when I knew things were changing! It is vital that if your DH gets worse you can step in and make decisions regarding his health/welfare. Thinking of you 💐