Black spot randomly in vision?

I considered floaters...but this was in a dim room. I was looking at the floor (hardwood floor) and saw a small black spot on the floor. I though it was a clod, piece of dirt. I blinked and it was gone. I flipped out and kept looking at the floor in different areas, seeing if it would happen again and sometimes I would be staring at something and a black spot flicker (tiny) would appear in my peripheral vision or a little bit away from where I was looking. It looked like a speck of dirt or a ant. As soon as i shifted my gaze to the area, there was nothing there. If I didn't shift my gaze to it...but rather around it...the spot would move in the direction my eyes were moving. It just looks like a speck of dirt...but it freaks me out cause, doesnt that mean I am having visual hallucinations? And why wouldn't it be if not? Does anyone have this happen