Less than 3 months ago i was diagnosed with tmj or tmd? since that time the left side of my face has not been functioning at all. is this normal?

See doc: If the l side of face is not functioning at all you have a major problem such as bell's palsy or a stroke. If you really can't move your face it is time to see a doc sooner rather than later. ( 3 months seems to be a long time to have this problem without having seen anyone....).

Neurologist-Pain DDS: See a neurologist and also try this. There are two academies of dentists with special focus on oral pain. Check for members at these websites: aaop.Org and aacfp.Org on internet.

No, needs treatment: Tmj\tmd needs to be diagnosed and treated in the early stages to prevent more serious problems as time goes on. You need to be properly evaluated and treated by a dentist who is knowledgeable in this area. This won't go away on its own. There are many conservative treatment modalities available to relieve your pain, safeguard your teeth and joints.

See a dr.: This could be an ailment called trigeminal neuralgia. Hard to say but i would see a dr./md first before considering it as all related to the tmj/tmd.

Orofacial Pain: They are the expert in this field. Temporo-mandibular disorder is the second most frequent cause of orofacial pain after dental pain. Proper diagnosis is the key for the successful treatment. See an orofacial pain practitioner for a consultation and management.

Depends: Depends on what you mean by "not functioning". If you mean your face not moving normally - like paralysis, that IS NOT TMJ. If so, see your MD ASAP.