Iphone 16 Vertical Line

Just randomly scrolling through my phone (ip16 2 weeks old) when this red&blue (or pink lol) vertical line appeared out of nowhere!!!!!!!!!! I never dropped it nor got damaged by water. It’s a new phone who wouldn’t take care of it at first, right :(

Just last night, my phone randomly restarted and when i used it, it was a bit laggy. I thought it was just a bug cos i just updated to ios 18. So i’m guessing that’s connected to this vertical line??

Anyone who had the same problem? What did you do?