I've have similar issues with my left foot, a very short excruciating pain, which recurs depending on the angle of stepping; My X-rays showed nothing, so the Doc put me on asteroids-prednisone, pain-killers and antibiotics to prevent side effects of prednisone; I am also having to rest a lot, this seem to work. I will also try to get burdock root since I certainly prefer natural treatment.
I have a similar problem. Every time I wear boots that rub against my left ankle I get this sharp stabbing pain. It feels like it's a nerve. After a couple days it goes away if I stop wearing shoes that touch my ankle. The pain is so excruciating I can barely walk and I have to take my shoes off. The pain subsides, but it's still there if I even touch it gently. It's not just one pair that does it, it's any shoes that rub against my left ankle. I am only 22 and this has been happening on and off since I was about 15. It seems like hiking boots do it the most, but I also wear them slightly tighter than other boots for stability purposes.
If it is warm to the touch, I would get it checked to make sure you don't have a blood clot lodged there.