Folklore regarding mirrors goes back literally thousands of years- long before mercury could be blamed for causing hallucinations.
Its Roman lore that gives us the '7 years bad luck' after breaking a mirror, as they saw it as breaking ones health, and that life renews every 7
The occult practice of scrying can involve mirrors- black obsidian ones in particular, but regular old modern 'silvered' mirrors are said to work
just as well. Nostradamus used a bowl of water to gaze into the future, but scrying has been used in many cultures for hundreds of years in the belief
that it can divine the past, present, or future.
A candle magic ritual goes like this- Sit in a darkened room facing a mirror, place the candle in front of you and look at your reflection, let your
eyes relax and after a few moments your face will begin to change. Allegedly, your reflection will reveal what you looked like your past lives.
Most mystical practices agree that a mirror is a doorway to other realms, and the covering of mirrors around a dying relative to stop their spirit
becoming 'trapped' within it goes back a long, long time. If a dead person sees himself in a mirror, his soul will become lost or have no rest, or
he will become a vampire. The power of mirrors to suck out souls is illustrated in the Greek myth of Narcissus, who sees his reflection in water and
then pines and dies.
Not confined to the West, ancient Chinese magic mirrors go back to the Han Dynasty (206 BC – 24 AD) and were made from cast bronze. In Russian
folklore, mirrors are the invention of the devil because they have the power to draw souls out of bodies. In other lore, seeing a corpse reflected in
a mirror puts the living at risk for having one’s soul carried off by the ghost of the dead. Seeing one’s own reflection in a mirror in a room
where someone has died means one’s own impending death.
It is also considered unlucky to look into a mirror in moonlight or by candlelight, for one will see ghosts, the devil or a portent of one’s own
death. In Persian lore, ghosts may be seen in a mirror by standing in front of it and combing the hair without thinking, speaking or moving. Then of
course we have the vampires inability to cast a reflection in a mirror........a total work of fiction, dreamed up by Bram Stoker (although he was
aware of the occult and folklore meanings connect with mirrors).
Finally, from the website of a modern expert on the paranormal, this:
"Badly placed mirrors are sometimes a factor in hauntings. Mirrors should not be placed at the foot or head of a bed, for occult lore holds that they
may provide a doorway for spirits to enter the room. One should not see one’s self in a mirror while in bed for the same reason. Mirrors should
never face into each other, which warps space in peculiar ways. Most of the time, mirrors are not going to pose a paranormal problem. However, if
haunting phenomena is present and persistent, and takes place in the bedroom, consider moving or removing mirrors."
Sounds like you did the right thing, OP!