What Causes Horrid Taste In Mouth After Wisdom Teeth Removal?

Hello, I recently had all four wisdom teeth pulled out last Monday, 4 days ago, and for the past two days I have experienced an absolutely horrid taste in my mouth coming from my lower right socket. It comes and goes on it's own but happens repeatedly and makes me feel quite sick to the stomach. I put some gauze back there and it came out with a brown whiteish almost pus/mucus/fluid on it and smelled putrid. The stuff secretes itself from the socket and I don't understand how or why this happens. I'm not in a sufficient amount of pain to where it would most likely be a dry socket but the taste is unbearable and I would like to know if it is maybe infected or not, I have been taking ibprufen and antibiotics that I was given and have been rinsing with warm salt water. Any help?