Just read your post. I have had issues on/off with my Eustachian tubes since last year. I had Eustachian tube dilation surgery in June of last year and was doing great UNTIL... Ragweed season. My more problematic ear (left) immediately reacted along with the rest on my upper respiratory tract with swelling and inflammation. Fortunately, as a result if the surgery, I could pop my ears. It didn't do much and I passed 2 Eustachian tube function tests. The pressure feeling gradually dissipated over 2 mos(sept thru November). I began allergy shots in October to start eliminating my allergies, but won't see results for at least a year. I missed 3 shots due to being sick in December and when I received my next shot in January, I woke up the next day to the same old annoying allergic symptoms. My allergy dr gave me prednisone for 5 days to help, and it only slightly did. He didn't think it was a reaction to the shot. I've had one Eustachian tube function test that came back normal, and I'm going to recheck soon just to keep an eye on it. I also saw a sinus specialist ( no sinus disease, thankfully). He only noted a deviated septum which he said is normal for about 80% of the population. He suggested I continue with allergy shots till its been a year and if its no help, then I could consider septoplasty, but he felt it wouldn't help my ears. He said the clue that it most likely wouldn't help was because my ears still react, despite the widened Eustachian tubes.
If you are looking for Eustachian tube help, I'd try to see an audiologist in your area that is able to perform Eustachian tube function testing. The place I went to had a machine called a tympstar that has a setting to test Eustachian tube function. It's super easy, but slightly uncomfortable. Basically they take a tiny probe and put it securely in your ear. It then measures the pressure in your middle ear space. Then they increase the pressure (airplane feeling) and have you swallow a sip of water hard. Then the machine checks the new pressure. Then, they decrease the pressure significantly (crazy airplane feeling again), and have you swallow again. At the end, if your Eustachian tubes function normally, you'll see a shift in middle ear pressure each time you swallowed. They will of course interpret the test for you and tell you the results. You can then know for sure what's going on in your middle ear. It's important to check with the audiologist to make sure they know how to do this test before going in.
I hope you'll find out what's going on soon- if it is ETD, then it's important to find the underlying cause and treat that, as well as the ETD. My underlying cause is for sure allergies, as I've been tested, but yours may be different. It definitely can be an annoying, sometimes even disconcerting condition! Hope this helped somewhat.