Hi!I am a 21-year university student.I have a big problem~bad smell from nose.Very bad smell!I can't smell it,but,it really exist.Sometimes,it can spread too far when I in a room.I have had it for 5 years.It let my life so hard.I found it diffucult to contact people.I don't know where it had come from.During the dark 5 years,I have met several ENT doctors and made CT scan.But there is nothing,all is well except chronic rhinitis .No nasosinusitis and atrophy rhinitis .I had some medicine including Chinese medicine and washed my nose by salt water.It is still there.My nasal mucus flows backwards and sometimes I feel my nose dry.There is a notice that 5 years ago,I once lived with my sick pet dog in a room.She had an unpleasant smell.I don't know whether there is a connection.Please help me.Thanks!