I too have olfactory symptoms. Smells like an old cigarette burning, or electrical fire. Nauseating. A neurologist I saw recommended saline spray. I got the .09% I believe. It works very well to relieve those symptoms. No side effects from using it. Can use several times a day but I use it one time and it works for a very long time. If I sense it coming back, I just spray and it keeps it at bay.
Hope this helps. Since my last infection in February, 2024, I can barely smell or taste anything. Except for the disgusting smells of course! Par for the course. Good luck to you.