I am not a doctor, but there is a possibility that one could experience the symptoms of ENS without having surgery. While it cannon technically be called ENS without surgery, one could develop something called atrophic rhinitis naturally. This can be caused by hormonal changes (reduced estrogen...typically coincides with menopause), anatomy at birth, overuse of corticosteroid based nasal sprays, and probably other factor's as well. Regardless, the result is just as uncomfortable. There are a number of treatment options from most invasive to least: nasal estrogen cream, hyaluronic filler, PRP injections, adipose derived stem cells, and surgical submucosal implants to bulk up and close off the open sensation. Though you don't technically have ENS, an ENS specialist should be able to help you find some relief.