What Causes Constant Giddiness And Headaches?

I'M HAVING DIZZINESS, HEADACHE, AND I'M ALWAYS FEELING AS IF I'M ABOUT TO FAINT.I DID SOME TESTS AND EVERYTHING SEEMS NORMAL. BLOOD PRESSURE, BLOOD SUGAR, AND ALL BLOOD COUNTS ARE OK. THE NEXT DAY I WOKE UP WITH A BLUEISH MARK AROUND THE AREA WHERE THE NEEDLE WAS USED AND THE WHOLE OF MY BODY ACHES. CAN YOU TELL ME WHAT IS WRONG WITH ME?