@sdgoddard10- if you saw this ENT for the first time in Nov and you had surgery in Jan, then this surgeon gave you a total of about 4 to 6 weeks under his/her care to exhaust all medical therapy management and book surgery that quickly?
All people with ongoing sinus inflammation need to have allergy work up or test before any surgery is recommended. That is part of the standard care in the ENT algorithm.

I had sinus surgery performed myself. It wasn’t until after the procedure that I started suffering headaches, breathing issues etc…

ENTs do not know anything about the inflammation/immune response. That is not their job. They are surgeons. They look through the scope of cutting and removing.

If you had ongoing sinus inflammation “chronic sinusitis” I’m curious what was ever addressed systemically?

You say you had sinus inflammation? Did this result in a lot of infected thick yellow mucous?
I have learned too much now from ENTs themselves. These FESS surgeries have high failure rates, and revision rates, due to the fact that they should have never been done in the first place.
There is only a very small percentage of people who will ever need sinus/nasal surgery from an ENT.

While can’t speak specifically to your mouth breathing. There are also many other reasons for mouth breathing.

You are still early on in your recovery process. What was your after care instructions for a positive recovery?

Also-the description of your procedure is aggressive surgery. These are often referred to as “minimally invasive”. This is absolutely invasive as most of your organ system was cut into and parts of it removed.
When people have lung inflammation doctors don’t go in and remove portions of the lung. They address the inflammatory response. That’s why these surgeries make zero sense.