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Have it checked! You may see your primary care doctor or ENT .The sudden change could be due to fluid in the middle ear space ...serous otitis ( that may result from Eustacian tube dysfunction) it could be due to earwax ...Many causes may have a straight forward treatment ...so get it checked ! Don't freak out ! Hopefully you will soon find that it has a treatable reason that will allow you to have restored normal hearing soon .
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Anthony Bray MD