Chriopractor used electronic gadget on head?

my chiropractor used some type of gadget put it on the left side of my brain I think massaging it with some electric currents saying that it stops the pain im feeling in my shoulder or helps with it. that spot started to pulsate last nite and today I'm having numbess and tingling on the left side of my face from above my lip to above my eye? any one here know what that was or had this?|||If I were you, and the irritation lasted into tomorrow, I'd get my tush to a doctor (a real one) ASAP.