I still have bad speech comprehension and miss sentences. I'm not sure if it is from hearing damage and/or brain damage from antibiotics. by the way what are normal numbers for a DPOE distortion product otoacoustic emission test for DP and NF? I read on a hospital website that hearing mumbling is a common hearing loss symptom. I'm wondering where the damage is in my inner ear, or brain nerve, or middle ear or somewhere else? I'm just having a terrible time with these ENTs ignoring me or sending me for testing.