Go to the dentist, ASAP!!
People die from dental abscesses. The infection can spread to your brain. You cannot clean out the infection because it's inside your tooth. Ice and salt water only diminish the symptoms. Even antibiotics are temporary, and the infection will return with a vengeance shortly because you have to treat the source of the infection... the cavity that has led to infection due to the pathway for bacteria to enter the root of the tooth.
You're going to get either a root canal or a pulled tooth. Root canals let you keep the tooth after a crown. They aren't a big deal either pain- or cost-wise today. But even if that wasn't true, both are preferable to dying.