It's not possible to diagnose or prescribe over the internet.
In addition, I have questions about the description, "blocked Eustachian tubes". Does this mean you cannot equalize, or that you have feeling of fullness and decreased hearing? If the latter, you probably suffered some barotrauma from not equalizing completely and early enough. This results in fluid accumulation in the middle ear, which takes some time to resolve. Decongestants can help that process, but it's still not going to resolve immediately.
If it's been a number of days without any improvement, or if you have severe hearing loss, or any pain, you should get in to see an ENT doc as soon as you can. Bad barotrauma, involving the inner ear, can result in permanent hearing loss, but can also respond to appropriate treatment if it is begun in a timely fashion.
BTW, you don't have to have been aware of any equalizing problems to have barotrauma. I have a friend who's a good, regular diver, who complained to me that he was having some problems with bubbling and crackling noises and a feeling of fullness for several days after diving. I suggested it was inadequate equalizing, and he told me he was sure he was clearing his ears early and often. I got a note from him a couple of days ago saying that his last couple of dives, where he REALLY focused on ear clearing, have not resulted in any symptoms. So it doesn't have to HURT to do damage!