Strained foot - mainly arch. There's tightness, no swelling, enough pain on push-off (even walking) to just not dare push off, just limp.
Ice, heat, elevate, keep down and let blood get to it, arch supports, heel lifts, hard liquor and cocaine?
BTW, it's not PF. Had that before and this is definitely not that. Doctor agrees. Also, no stress fractures.