Hi so I'm a newbie so it can't be because Of some magick but I thought I heard music playing(sweet music not dubstep) outside my window and no cars pass by my house I live in the middle of nowhere so it wasn't that... Then I also could've sworn I saw a flash of like peacock blue outside my window when I was closing my shutters and finally I think my bedroom door shimmered for a few seconds. Could this mean anything?
Check your eyesight, and also check for any abnormalities in your brains bloodstream or brain itself(clogs, tumors or something similar).
But even if by some weird miracle you did saw something it was most likely nothing to worry just leave a pen and a paper next to a white candle(it does not need to be white) before you lay to sleep they will write what they wanted to say if anything.
I agree to get your eyes and head (both brain and mental functions) checked, see if you have any past traumas... Then go ahead and see if it is something. Since you don't know if this something is good or bad, I would go with some purifcations and not do any exorcisms (but still purify things and the house and property) until you know more about this something. The suggestion about a candle and own and paper sounds like a good idea, though. Hopefully, it's nothing bad.