Unplug everything (better yet turn off every breaker). Call the utility. They'll come out immediately.

I had this happen at my home. Voltage all over the place. Sometimes turning on an appliance made lights brighter, or dimmer. Blew out several light controls, a computer, etc. Turned out a tree rat (squirrel) decided the neutral at the power pole was an ideal thing to chew on.

Technically the power company is liable so they treat this as an emergency (wouldn't want to get some one electrocuted).