I have a metallic taste in my mouth along with being light headed and having a ringing in my ears. do you know what this is about?

Not dental: That doesn't sound like a problem of dental origin.

Dysgeusia: is a change in your sense of taste due to a variety of causes; from medication you may be taking to dental problems. Dysgeusia is not very common. Fortunately, many of the causes are temporary and life-threatening, but the disorder does affect your quality of life. See your PCP for neurologic exam and evaluation.

Multiple symptoms: See your dentist for a thorough dental evaluation & a physician for a medical evaluation. The ringing in your ears and being lightheaded may or may not be related but both are unlikely related to the metallic taste. There is a multitude of causes for each of your stated symptoms and you need to be seen for medical and dental histories, clinical exams & personal evaluations to resolve these issues