I have had sinus problems my whole life, and when I first started diving, clearing my ears was so difficult that an instructor told me diving just might not be in the cards for me. Then I read a DAN article about using decongestants like Sudafed or Afrin, and they differentiated between diving with a cold (never do that) and using things like that to make it easier to equalize. I did use that for a while. I worked and worked and worked at equalizing. I did it on the plane on the way to a dive site. I did it while reading. I did it while snorkeling in the hours after arriving on a dive vacation. I did it on the boat on the way to the dive site. It got easier and easier and easier for me over time.
Today I take nothing, and I have no trouble equalizing, even though I still have the same sinus issues I have had all my life.
Today I take nothing, and I have no trouble equalizing, even though I still have the same sinus issues I have had all my life.