Yes My Name Is Stephen. A Couple Weeks Ago I

Yes my name is Stephen. A couple weeks ago I went to the dentist he told me I had an abscessed tooth. He said he did a partial root canal and would finish it in a few weeks and put a crown on. He put me on penicillin and said the infection would clear up. That was two weeks ago. Well I have been having headaches and sweating a lot. I'm afraid that the infection spread to my brain and why it's causing my headaches like I said been having them ever since I've seen him. Please help me with what you think I should do. Thank you