Hello, light:
How bad would that be for my overall health? I cannot walk at all at this point, even after resting it for a week.
It depends upon how much You have used steroids in the past. Occasionally, I need a pred taper for my gout (and can You be certain what You have now is not gout?)
The EVOO and borage seed oil should help if it is AS, but if it feels SHARP, like walking on broken uneven glass, it could be plantar fasciitis. In which case I recommend beating feet very roughly against the cement (gunite) sides of good Jacuzzi pool--strike from every possible angle; it will be sharp pain at first but will dull rapidly alternate against jet, then more strikes.
Later on, take magnesium citrate (~2oz) after this and eat fresh fruit: Pineapple, grapes, cherries, plums, melons, blueberries, etc. If up for it, do fruit monodiet 2-3 days cherries only would work.
There is an NSAID cream available--Pennsaid (I'm AFRAID of it but my wife has used it with some success). Also a stretching sling for night use to keep foot in tension. Exercises against wall--push hard against food at very acute forward angle.
HEALTH,
John
