@bootblack I have had congested and/or infected sinus periodically for more than 20 years, often times affecting my hearing. I get easily sinus irritation due to inherited pollen and dust allergies.
Things became worse with my hearing following recurring sinus infections for almost one year after having COVID in 2022. In addition to antibiotic treatments when things got really bad, my Primary Care Physician, my ENT and my Immunologist all recommended rinsing the sinus with lukewarm saline solution (I use the over the counter saline bags from NeilMed) whenever the sinus becomes stuffy or just starts to become irritated. As needed, I might also use a nasal antihistamine spray and a non-drowsy making tablet like a generic Zyrtec.
My physicians have all suggested that such congestions can easily lead to infections, including in the ears, and it makes it easier to catch a virus, like the flu or other.
Any sinus condition affects my residual hearing on the side where I still wear a hearing aid. On the other ear I have cochlear implant since October 2025. I don't want to take any risk getting an ear infection on either side.
You may want to verify with your ENT or PCP whether or not a saline rinse would be an option for you to try.
Otherwise, this Support Group and related Forums on Mayo Clinic Connect have plenty of helpful postings, including from Volunteer Mentors. In the present support group, @julieo4 has been of significant help for me.
I hope you find the best way to get relief from your congestions.

Just one foot note: based on my own experience, some medications against allergies, flu and colds may cause or increase tinnitus. I do check for side effects of any prescription or over the counter medication before I take them. I had to learn it the hard way.