Answer:
Misdiagnosis will always be a possibility when any medical condition is diagnosed, and some illnesses are misdiagnosed more frequently than others.
Any person believed to be showing symptoms of illness - including dyskinesia -should be seen by a doctor, who will, if necessary, refer the patient to a specialist in the field of the suspected or diagnosed condition.
Support groups for sufferers of various forms of dyskinesia exist in many areas; your doctor should be able to give contact details for them. The link below gives data on tardive dyskinesia and also has links to information on Tourette Syndrome and tourettism.