Back when I was a teen (a gazillion years ago) we always stored our angora sweaters in plastic bags in the vegetable bin of the 'fridge. It didn't help. They still shed like mad.
But I didn't realize that alpaca did the same thing. I will avoid it like the plague. Inevitably those fuzzies get in my eyes and drive me nuts.
Sorry to hear about the blanket mishap. I'd be furious with myself if I had done that.