Tooth pain sometimes severe. xray shows no cavity but tooth is filled. also same side has an impacted wisdom tooth. very sharp pains to cold not so much with hot. hurts off and on sometimes without even drinking anything cold feels achy?

Sight unseen, I suspect it is the tooth with the filling. It may be "leaking" and the filling probably needs to be replaced, especially if it is 10+ years old. Radiographs don't always show every problem, so you need sometimes treat from experience.

It is possible that the tooth with the filling has a fracture. Further treatment such as a crown and a root canal may be needed. An root canal specialist; endodontist will have a microscope to see the fracture and will do various thermal tests on the tooth. Some teeth with fractures are not repairable. Get an appointment with the dentist or endodontist soon. Until then, stay with soft foods.

X-rays are marvelous, but as they are a 2 dimensional representative of a 3 dimensional object, there are limitations. Tooth may be fractured, or may have traumatic occlusion, or 3rd molar may be causing damage. Teeth with large fillings sometimes have necrotic pulps because of previous cavity. Have tooth evaluated by specialist Endodontist.