First time posting here, and using mobile so excuse my formatting.

So this happened a couple hours ago, but i get these once every few months.

I was at my sisters house dropping off some money for the car i bought from her, but as soon as i started knocking on the door, i got an extreme sensation of deja vu, like, everything i saw and heard i could swear on my life had happened before, but it was also like i was seeing in third person, and everything sounded distant. Afterwords everything just felt off, and i felt intensely sick to my stomach, on the verge of throwing up, and i just felt wrong in my body, and any memoies i thought of felt almost like they weren't mine.

Its a couple hours later and i feel perfectly fine now, but i get these every couple months, with varying degrees of intensity.

I remember one from highschool, i was doing a math problem and i kinda got stuck in my head doing it over and over and over, until i felt really sick, and when it was over i looked around at my friends, and i knew them and had all my memories of them, but they felt like strangers and like i didn't know them.

Im 22 years old, in reasonably good health, and i have no history of any mental conditions, never had anxiety or panic issues, very stable moods, very calm kind of person, these events are the only things that kinda freak me out about my mental health, but they are very infrequent, always go away after a couple hours, and the only comments on my change in behavior during them is being quieter and looking confused.

Sorry for the wall of text, but can anyone help identify what this might be, and if i need to see someone about it?

Edit: format and spelling errors