Hi, Without an exam, I can only give general information and cannot say in your particular case, but generally, it s either a physical disruption of the sinuses and gunk accumulating in them (but that is with infection taste and smell, not perfume) or, more likely, irritation to the nerves involved with smell and/or the nerves growing in wrong and being disrupted, irritated and giving signals to the brain when there is no smell. There are a lot of treatments for nerve activity that is overactive. Any nerve damper including all anti-arrhythmia and all anti-seizure medicines. They generally are fully effective at very low doses. And side effects do not occur at the doses used for twitchy nerves, so, safe, cheap, effective. Also, amitryptiline and local lidocaine might be helpful and they also are quite safe and inexpensive. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Matt Wachsman, Addiction Medicine Specialist