Dragonfly , you've posted on an open forum with a medical problem and like everyone who does this there can only be one correct response .
See a specialist , in this case an ENT specialist .
We can give advice about what we think the problem is but there is no way to be sure of a diagnosis .
It sounds as if allergies are causing a blockage in your sinuses or you could have a sinusitus or maybe you snuffled too much coke :naughty ( joking ) or it could be something much , much worse , this last one is very unlikely but only a specialist can tell you .
I know most ENT people recommend Otrivine nasal spray for diving , this can help with equalization problems even if the sinuses aren't blocked ( my wife has narrow eustachian tubes and it helps her to equalize when scuba-diving ) .
As an aside , ENT hate people putting stuff in their ears , any stuff ,they really don't recommend it .
One little trick is to bring your chin towards your chest when equalizing ,
some people find this is easier , sometimes cranning the neck to see where the bottem is can make equalizing harder .
These are titbits which can be useful but you need to see a doctor to be 100% sure your taking the right action .
SO DON'T DELAY SEE A DOC' TODAY

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Regards ,
Dave .