I recently had a head cold in which my Eustachian tube was completely clogged. This probably happened due to so much sinus congestion. I tried many remedies, but the one that fixed it was breathing steam from hot water with ACV. Put a towel over your head and inhale over the hot water. The trick is to inhale through your nose very slowly so that you don't close off the opening to the Eustachian tube. This really helped me out quite a bit. I hope it can help you too.
Apple Cider Vinegar cured my ear infection.
I had itchy Eustachian tubes (connection from the ears to the throat) from seasonal allergies. If left untreated I get a very bad cold. I put some drops of ACV into my ears until I felt it pass all the way through to my throat (I could taste it). The itching stopped immediately and I never developed a cold. You can also put some on a Q-tip and it works just as well. Michele-NYC.