Hi. I definitely relate to this, as little the pain and symptoms are, it can really take your attention 24/7 and stress you out.
The thing is we don't know for sure what cause ETD, so doctors will usually prescribe the holy corticosteroids or anti-histaminic, which work in short term, at best. Be wary of the nasal spray as you could experience a rebound effect which doesn't help at all. When I used it it only made my nose even more full. Do you feel like your sinus are clogged (like you can't inspire fully) along with impaired smelling ? Because in my case my PFS induced rhinitis is likely the cause of my ears problems.
ETD definitely can be hormone related since post-natal and menopausal women sometimes develop this too. But in the end what triggers inflammation most of the time lies in the gut, and we know Fin modulate the microbiome so yeah looking for intolerances and taking care of the gut might be a good thing to do, some people have success when stopping carbs, dairies etc. I might look into antibiotics at some point if doesn't get better.
Yesterday I stumbled upon this video, the guy says that red light therapy cured his ETD ->
Heal Your Eustachian Tube Dysfunction | This method cured me in 8 days | Personal Experience - YouTube
And as scammy the device looks at first, it actually makes sense! I noticed a few days ago, that when I was laying on my side in my hammock under the sun, I had relief of symptoms pretty quickly. And it worked every time. There are actually a few studies on LLLT benefits and some people use it for other painful conditions as well.
He's also saying to take cold showers and drink plenty of water. On a side note you may want to stop supplements for a few days to see if you feel better. There is always room for unexpected interactions.
For what it worth I ordered the LLLT device he used. If it can help me manage the symptoms until I recover I'll take it!