Regarding sudden activeness of my father

Hello doctor... There's a problem with my father. He is 61 years old. From the past so many years he has been behaving so differently only on a particular time frame like November starting to March end and remaining the whole year he'll be fine. From November to March he behaves so arrogant, short tempered, and intakes so much food, doesn't sleep at night, always travels, doesn't control his thoughts, talks with himself, fights unnecessarily, doesn't value others, so hyperactive, behaves like a teenager and many other things. From the past 2-3 years this keeps on becoming severe year by year. And when we suggest dad to go to psychiatrist he said "I've already visited a psychiatrist, they've said because of the age factor these things will arise. So we have requested him again to go for a checkup with a psychiatrist but he always refuses by saying "I'm completely alright, i don't require any doctor consultation for me etc. we've requested him a lot but still there's no use. plz help me.