Your parasite, also known as a duplicata incompleta,
is what would have been a conjoined twin attached to you at the head,
but its development was stunted in the womb.

You often have the feeling that you are not alone, though nobody
accosts you, or blocks your path. More, it seems you possess a sort of
guardian or alter ego, someone who watches over you, but who sees
things you do not see, or sees the same things, but from an inverse
perspective. You are occasionally stirred by sensations that have no
identifiable source within conscious experience. You occasionally
perform actions you did not intend, e.g. putting away the milk in the
freezer, that seem to reflect some sort of logic, but a logic that is
back to front, or topsy-turvy. Sometimes it is a burden to know that
for everything you think you understand, there is another
interpretation you cannot access—probably one that, if revealed, would
turn everything you believe on its head. Usually, though, this is a
source of secret satisfaction, as it may be the case that what seems to
you your worse mistake may be in fact your salvation. You are
particularly drawn to the optical trickery of the Changing Head. Your
literary form is the ghost story.
You are related to...
The Two-Headed Boy of Bengal, born in
1783 in Mundul Gait, Bengal