I didn’t see a doctor. . I don’t know what caused it but I assumed it was my allergies or just old age (but I was only 57 at the time). For a while I was overreacting to smells and then I just seemed to lose my sense of smell. And then after I had a Covid this past November I noticed I had my sense of smell back. I don’t know if it’s related to Covid or coincidence. I never completely lost my sense of taste though.