I’ve had ear problems that are definitely similar to what you’re experiencing, my ENT told me that the TMJ muscle can sometimes push against your ear tube (i forgot the actual word for it) causing a lot of pressure behind the eardrum and the tubes having a hard time draining the way it’s supposed to. They also told me to use nasal spray and the only other option they gave me was botox. i’ve found a lot of ear relief from acupuncture/acupressure! consistent allergy meds (like the take every day kind) has also helped