What Causes Dizziness Along With Headaches And Body Spasms?

Hi , at Christmas my defibrillator malfunctioned . My potassium was also low so in addition To having my defibrillator replaced I got new high blood pressure medicine and a beta blocker. Recently I have been getting dizzy spells, disoriented, headaches and body spasms when laying down before bed. I m scared. Could my blood pressure be to low? Could it be the medicine. I m on spiralactone andcarvedilol.