I Had a Septorhinoplasty Done in About a Month. I'm Told I Have ETD Now?

I don't think that I would rush into another procedure, such as balloon sinuplasty to address your "ETD" also known as eustachian tube dysfunction ie. pressure build up in your ears.  It sounds like you already tried various allergy treatments.  The next step would be to try an antibiotic along with a full nasal exam with an endoscope, in office (a camera).  If your symptoms persist, a CT scan of the sinuses would be helpful.  It is possible you developed a sinus infection, unrelated to surgery.  Follow up with your surgeon esp. if he is dual board certified, ENT and plastic surgery; otherwise consult with an ENT specialist.

Good luck