Oh goodness, yes the poor lil possum!! Anything to do with the ear is so sensitive!

I can tell you that I have had a spider in my ear for 3 days and it was horrible. I kept thinking my ear was about to explode or something, but it was the spider moving and as it was right on my ear drum every lil move the spider did made a huge crunching sound.
I had the spider syringed out with water.

Hopefully the lil fella has a good nights rest if possible and you find out what is upsetting him and his ear tomorrow!