I had a lot of mouth pain on the right side of my mouth like an itchy feeling that kind of radiated in my head and neck. I couldn't tell where the pain was coming from. Just the side of the mouth it was coming from. I went to the dentist and he filled a deep cavity. A week later the filling did nothing to reduce the pain so he performed the first part of a root canal (removing the nerve and cleaning canals). And said he would finish the rest when my pain goes away. He also put me on antibiotics which I finished days ago. Now a week after that, my jaw feels swollen and I feel like I got a huge toothache feeling where the itchy feeling was before but I can't tell which tooth it is. It dosen't even feel like that one but I don't know. None of the rest of the teeth had cavities? Help?

The dentist told me several times hes stumped and he dosen't know. And I got a second opinion and they told me the same thing.