Washing soda crystals inside a towel - hold it up against your ear, and leave it there for a few hours (i.e. use it as a pillow and go to sleep on it).
This will drain the ears.
Also helps for other swelling - I used it on my knee when I f'd it up a few years ago. The best part was the next day, when the crystals were all wet with the liquid that had been inside my knee the night before, and I was chasing my friend around yelling "KNEE JUICE!!! KNEE JUICE!!!"
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