What is my obsession with coughs, sneezes, and burps?

Whenever someone coughs, sneezes, or burps around me I have to leave the room, or put my mouth and nose inside my shirt collar/sleeve and take deep breaths. If I'm in a car when it happens, I have to roll down the window and scoot towards the door, but I don't calm down until that person is away from me. Sometimes people biting their nails or rubbing their noses affects me too, but not as often. This has only been going on within the last couple of months. At first it wasn't a big deal, but now it happens multiple times a day. Also, if I'm the one who coughs, sneezes, or burps I don't do anything, I act normally. Is this obsession something that will p or will it get worse??