OMG. I am sorry this happened to you. I have been dealing with something similar I believe. For over a year, I have had ringing/hissing and pressure in my head. So bad at time it causes vertigo and nauseous all vomiting. No fever or actual pain. I had even test you could imagine. MRI and MRA of the brain saw the ENT twice diagnosed me with meniere's disease. I was on amoxicillin 3 x. Vertigo medicine nauseous medicine as well. Everyone was just trying to manage my symptoms. Then I was talking to my daughters orthodontist and he asked me to get a dental xray. He found I needed a root canal in a tooth that I had a crown placed 2 years before. So I went right to my dentist and once they removed the crown, you could "smell" the dead tooth underneath. It was disgusting, now remember I had no jaw or tooth or gum pain no swelling nothing. The dentist extracted the tooh right there, put me on clindamycin for 2 weeks and all my symptoms were going away. I didn't want to jump out the window anymore. But it only lasted for 3 weeks. I was so upset and disappointed. But went back to the orthodontist and got a second xray just to be safe, and geeze low an behold there was still a piece of the tooth root in there. So I went to a different dental surgeon to have that removed and to have the whole socket scraped out and had to add a bone graft. I am now back on antibiotics and healing up well. We will see of this insane infection is finally gone. Yes a tooth infection underneath a crown caused me so many problems and no doctor found it. It was because of a conversation I had with a great dentist. He saved my life.