I've posted on the use of warm (sterile) saline water, and a lot of hanging upside down over the bath.
Search me, medical, up to a year ago. A key search word might be salt, but I've had quite a lot to say about that, so be patient.
It has saved my bacon on more than one occasion.
Just repeat the same method of clearing your ears as you would on the decent while being upside down and having a good reserve of the mix in your nasal cavity.
Do a lot of extreme sniffing, then run the procedure again.
Very messy, but very affective. Eventually you will hear the progress, but remember the sniffing, or holding your nose and sucking as hard as you can, is a vital part. There's a limit to just how much air you can pump into your head!