Thank you for your query.
Your eye and ear symptoms are those of Vestibulitis (inflammation of the balance apparatus of the middle-ear). Tha causation of which is not fully understood. Some research points to a viral infection of the eighth cranial nerve
. This can not explain your weight gain, one possibility is that you have an abnormal sugar metabolism
. The best person to examine your Vestibulitis would be an ENT, I feel that a physician should also give you a thorough metabolic screen, including your sugar. I trust this information helps you find an answer. Kind regards.