Triangle shaped dark craft hovers and then flys off at phenomenal speed

I was walking my small dog one night in Orlando College Park area.  I heard what I thought was a whirring sound of a helicopter and saw lights and assumed it was a helicopter landing at the nearby hospital. 
It began to fly directly over me and hovered, when I looked up, I realized (gulp) that it looked nothing like a helicopter and looked like a small version of a  stealth jet, which of course cannot hover.  It had very bright lights emanating from it all around the sides and at least one shining down from the bottom of the craft. 
I looked over to my dog and she was looking up at it and was mesmerized, but not barking, which she would normally do at loud big things.  
I looked back up at the object, which was about 40 to 50 feet above us, and it suddenly moved sideways for about 200 feet, then went up into space at an incredible speed that within 30 seconds, it was up so high it looked like a star.  I had never seen anything move that fast ever. 
My father was an air force pilot, so I am familiar with planes and jets.  
For days afterward, my dog just lay around listless, and I felt strange as well, extreme fatigue yet a blissful mental state.
Witness indicates that the date is approximate.  PD