Brief episodes of vertigo, ear fullness, ear ache, and pulsatile tinnitus in left ear for two months (started after a cold with bronchitis). Also, conductive hearing loss in left ear. Outer ear and tympanic membrane look fine. Neur. Exam. Fine.

Meniere's disease? Are you having headaches as well? With vertigo, hearing loss and tinnitus (ringing in the ears perhaps??) you've described 3/4 symptoms of Ménière's disease, the only last symptom being headaches on the side of the hearing loss and ringing in the ear. You'd need an MRI to know that the inner ears and brain in general look OK. Treatment for this is challenging.