My Engine Burns Oil semi fast, Has a very loud.

My Engine Burns Oil semi fast, Has a very loud sound. Sounds like maybe the Catalytic Converter or some part of the Exhaust system has a hole but the sound comes from the Engine compartment. Some times it smells like burning oil, sometimes it smells like antifreeze, and others it smells like exhast. All those smells I get in the drivers seat while driving. Since the sound has started Power has dropped significantly and the more I accelarate the worse the sound. I keep oil in it at a large cost to me. I recently had to refill my Antifreeze as my car was begining to over heat while I was idle