question: on Saturday Morning I woke up normal, but within 3 hours I had aches that went from my lower back to my thighs to my knees, not pain but aches, I went to the local urgent care center and the dr there said is sounded like the flu, since it came on so fast, they did a flu test on my, which came back negative, and the dr said that just because it came back negative I could still have the flu, I never had a fever, or anything else. when I woke Sunday morning I was fine. My thighs feel a little sore, like if I would of worked out. Not sure what s going on