Did you ever find anything out? I am having the exact symptoms. I had a root canel and crown put on and she put something in there while preparing to put the crown on that sat me on fire all the way into my brain. It was the worst pain I had ever felt. The next morning my whole face was swallon and infected. They put me on a real strong antibiotic and it burnt my esophagus and I spent two days in the hospital. I am on my 4th antibiotic and it is still bothering me. When I am done with the antibiotic it gets infected again. It stays numb all the way up to my eye.
You probably need to see an endodontist for an evaluation and root canal treatment.