How do you know if it's demons or schizophrenia that is troubling you?

Consult one or more qualified professionals.

it could be both

Well, demons are just a human idea,

not actually a real thing,

so that narrows it down.

It is not hard to make a draft detection device

that confirms an actual draft.

Hang a big feather on a thread and video it

moving or hanging still,

at the same time you feel a draft.

If the feather moves, when you feel a draft,

then you can track draft to its origin,

with the smoke rising from a lighted cigarette.

This may be just a home maintenance problem.

Or a mental problem.

I would want to find out which.

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Regards,

John Popelish

There's no such thing as demons.  Therefore it must be something else.

Since demons do not exist, that narrows down the possibilities.  

Stephen gave wisdom from the holy spirit that none could refute