Have had a lower leg pain for two days. Went on a 13 mile brisk walk during which felt pain in lower leg area. Didn't sleep well 1st night?

because leg was hurting some. Painful area was red yesterday, plus got a headache all day. It still is a bit reddish today and a little painful (sorta like I was hit on the lower leg bone.) It hasn't been visibly swollen, though. Any idea what it might be. FYI, I'm a seasoned brisk walker.
Update: Brisk walked on a bike trail/cycle path that goes into the woods.
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