Fucking christ, my feet have been playing up, plantar fasciitis, with or without calcaneal spur (based on the fact the latter may be present in up to 50% of cases of plantar fasciitis, it would not be unlikely although I'd need X-ray or ultrasound to know for sure) is my best guess based on location.
Just forward of the beginning of the foot arch, on the heel side, as well as some pain in the center of the heel, it feels like having a red-hot nail driven into my heel, usually when I'm resting it, oddly its a lot better when I am walking or standing, but if I put my feet up that can set it off, comes on fairly suddenly, goes fairly quickly after taking all weight off my feet, and all pressure off my heels, although when its actually in the middle of causing pain it REALLY fucking hurts to blazes. Right now, I'm about to go walk upstairs on my toes, and prepare a morphine shot, because this is fucking excruciating, and I need to go work in the lab.