Over thinking is killing me!?

My mind wont shut up abut ANYTHING! I mean latterly anything. I my mind can easily describe a rock to a candle, Not my choice, I would Rather just let my mind rest. I think about the people im around during the day, about the object i saw, even about the weather patterns i witnessed, My mind will ise these things then describe them in the most literal way possible, from the texture to the way it was made. Its gotten to a point where im convened that everyone is against me and the whole world is a program to test humans in every day life (rats in a maze) Im tired of thinking so much and im loosing sleep because of it, is there a method to not think so much? or at least a way to knock my self out with minimal brain damage?