Unsure about what’s happening

Hey all! I’m not sure what is happening with me and was wondering if anyone else had some experience with this or knew what could be going on…

This has been going on for a long time now especially and more frequently as of lately

I’ll have these memories or I guess you could even say past events (because a lot of them I’m not in and have nothing to do) 

the ones I’m in with my family no one else remembers

the ones I’m not in I don’t share but they provide explanations or the story of a how things have come to be.

Sometimes I even have memories from my grandparents childhood!? 

Im not doing it purposefully. When they come into my mind I’ll start talking about it to husband and he listens but he really gets uncomfortable so then I’m usually in my head thinking about what I saw for the rest of the night haha. 

anyone go through this or know what may be going on?