the other night i started to get dizzy as if my equilibrium was off like when you stand up to fast. if i lay down and then get up or vice versa i start to get dizzy and it take a bit to readjust. its been like this for two days and with it i notice at times i have an elevated heart beat with numbness in my left arm. is this a stroke..heart attack? i feel fine other than those issues. anyone able to help.