Hello and hope you are doing well.
Your symptoms of altered smell perception and the puffiness on the side of the nose could most probably be due to sinusitis. Sinus infections can cause stuffiness of the nose with nasal blockage, which can make breathing through the nose difficult. It can also cause post nasal drip and lead to an irritation in the throat. This can cause the alerted smell. You will need to consult your primary care physician for proper assessment. In the meantime practice good breathing exercises, humidify your room and do steam inhalations.
Hope this helped and do keep us posted.
And I was being serious. I wasn't insulting you or anything like that. I would get an MRI just to be safe.
I think you should get an MRI of your head.