Thanks for the responses.
As to getting 20 'go see a doctor's... part of what I was looking for was to see if pinched nerves heal on their own, or whatnot, without treatment. But depending on the severity of the problem tomorrow morning... well, we'll see.
I don't really think anyone finds seiza all that comfortable
. I certainly don't, but my issue is with the hamstrings, not from the knees there.