Christians, if I think demons are infesting me, what do I do?

Is it like calling an exterminator?

Every time I try to open the bible, one sucker punches me in the back.
Update: -Aren't you talking to me now, Satan?
Update 2: -Jesus told me to see a priest. The priest told me I needed to take my clothes off for the exorcism, so that didn't work either.
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