What is wrong with me?

Tuesday i went tanning. I tan normally about once a week. I was hungry and thirsty but not to the extreme i was gonna get dinner after. During my session i became abnormally hot and nausous i got out early and started to get dressed i was dry heaving and dizzy i felt like i needed to dump water on myself. I threw on a rope and started making my way to the bathroom. I lost my vision and hearing and an employee started putting wet towels all iver me. I couldnt feel my body. Within 15 mins or so i was ok but shaken up. i went home and puked all night. the next morning i still felt sick but aa the day went on i felt betterish. The same thing has happened today. What could tbis be? Why has this never hAppened to me before?