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Hello. The middle ear contains organs involved in both hearing and balance. Otitis media (middle ear infection) can sometimes lead to chronic inflammation of the balance organs, resulting in dizziness, nausea, vomiting, and loss of balance. Note that such chronic inflammation may NOT be visible on simple examination of the ear drums. Transient lymph node (immune system gland) enlargement and low-grade temperature increase may be due to viral infections, which can definitely worsen balance-related symptoms. I suggest that you ask your PCP for referral/evaluation by an ENT (ear-nose-throat) specialist, in particular one who might specialize in managing vertigo, labyrinthitis, or cochleovestibular problems.