Hello Jel and welcome to TP there are loads of people on here looking after there partner, my husband is 65 he has vascular dementia and was diagnosed 4 years ago but has had it about 15 , you will gets lots of advice here,
Sorry you are not having a good day I learnt a long time ago not to argue with my husband as it gets me upset and Allen agitated I mostly just agree with him ,I learnt to choose when to say anything and when to keep quiet , you probably will as well,Find help as soon as you think you might need it as it can be a slow process ,
Best wishes, Jeany