It's okay, Madscot.

Pika might be onto something because a month ago, my SacroIliac went out
and i have been doing exercises for THAT ever since. so it might be a remnant of that problem.
I am doing more stretches, thanks everyone.
It's just so weird that after years of being sedentary with nary a thigh problem (actually, i was always so flexible, maybe because i had no muscles?) now I can hardly get my leg over my bike!