Stopped down by the river between Bangor and Brewer. The bright light was noticed circling in a tight fast circle. Way to fast and tight turns for aircraft. It kept the same flight path in circles above the clouds. It was almost right above the train bridge that crosses Bangor and Brewer.I have seen all military aircraft and none can make these turns at such a high speed. The only noise was a distant humming noise but could have been coming from the city. The light was so bright it shined perfect threw the clouds every spot it went. It was not a spot light or airport light. After seeing this for 7 minutes I felt fatigued and nauseous. After driving 5 miles outside of the city the sick feeling left.