His doctor said he has early onset dementia. Normally he is very pleasant, but about once a month, he answers a my question (not an angry one) with a tirade of "explanation" which is loud and overtalking me, lasting for maybe 10 min. Sometimes I leave, but I can't always if it is late at night. This last time I got angry back, which is scary and not part of my personality. We live far from our children so I have no one nearby. My question is: is yelling and overtalking a part of dementia?