What Causes Dizziness And Blurred Vision?

My symptoms are dizziness, light headed, the room spins, I get clammy, my vision won’t focus, and my hearing is inaudible. This all happens at different times there is no specific trigger and it makes me think I’m gonna pass out. It happened standing in a lobby, in a different room later with flashing lights, later again in an elevator, and also happened well I was just walking in a crowded plaza