Ask your dentist to recommend an orofacial pain dentist.
The pain is sharp and throbbing. It is not related to food, hot or cold. It's about at the location of the first molar on the left. The pain is worse in the mid-morning. 1000 mg of Tylenol makes the pain bearable (more of a dull ache than a sharp and throbbing pain). When the pain is at its worst, I also have a left side earache and a headache.
If there is no structural pathology identified , seeing an orofacial pain specialist is advised. Please keep in mind that not all dental pains are tooth origin.
Can you describe your symptoms: type of pain, when it happens, does anything in particular set it off, can you pinpoint a location?
I would also suggest getting a second opinion for another dentist.