How can you tell if a infection is spreading through your body from your tooth) worried it is spreading up to my brain and down to my throat.

Odontogenic infect: You need to see a doctor asap if you feel this way, because this type of infection, if really in progress, can be potentially life-threatening. Do not wait. Go now and i hope that this turns out to be something very mild, but do not want to miss the things that may be severe, no matter how unlikely.

Dental infection: You need to see a dentist to treat any dental infection, even if it does not spread systemically to other parts of the body. It can also do serious damage to other teeth, bone, and the jaw. Your physician can examine you as well to rule out systemic spread of infection.