Am I suffering?

Ever since the 4 month mark (one month ago) I feel as if I am going crazy. I look at myself and see someone absolutely disgusting, find myself hysterical at times for no reason. I love my son more than anything in the world but find myself breaking down almost daily to where I have to put him in his crib and hide in the closet till I am completely calmed down. Sometimes after I put my son down and run to the closet I find myself beating my legs or biting my hands, it's gotten so bad that my husband keeps saying he'll call the hospital and get me admitted if he sees more bruises on myself. I feel like I should talk to my doctor but I don't want to be thrown on drugs to solve a problem. Am I suffering from postpartum depression? Is there natural ways of coping?