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 Could be classic migraines with aura.  I get the same things. Both visual and auditory disturbances can occur several days before onset of headache.  You can also have migraine w/o the headache. Or it could be a number of other things neurological of course, e.g., mild seizures or neoplasms.  I would recommend a visit to a neurologist. 
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Harriet B. Jacobster, Au.D., CCC-A, FAAA Board Certified in Audiology IHAER - Institute for Hearing Arts Education & Rehabilitation, LLC hearingarts@aol.com  |