Wow! I count my blessings on having a quiet 5 yr-old!
One of my colleagues, however, was not so lucky. She had a hyperactive daughter who broke one her ribs when she was in the womb, and that was just a taste of what was to come! When her daughter was three, she had to have bars on her daughter's room windows and a lock on the door to make sure her girl didn't escape at night.
What my colleague found most effective was totally controlling her diet: no sugar - ever! she even went to the trouble of baking her own bread. As her daughter got older, she also got her into very physical activities and lots of sports. Her daughter is now married, is successful at her job and enjoys bungy jumping and hand gliding - extreme yes, but that way she can control all that excess energy.
All the best and don't give up.