2 months before he was sitting where fire crackers were burnt. Due to this his years became less efficient and since 2 months he is unable to hear any thing clearly. But the good news is that he can hear sounds generated close to his ears (say 3meters) but can't hear far than that. Sometimes he feels his ears is ok but sometimes he feels like he can't hear properly specially during evening and nights. He feels something is filled in his ears. Its the same feeling one wxperiences on high altitudes. Sometimes he can hear properly and sometimes he can't hear properly. Sir, please can you explain what has happened to him and what precaution does he take.?