inside lower leg mystery

Since last June I have had pain (off and on) on the inside of my lower leg, about 4/5 inches up from the ankle. Although it feels like something is tearing and is sometimes hard to walk on (especially when cold) if I massage the area it is very specific and small (about 2/3 inches long the bone(not ON the bone))
It comes on at the beginning of a run then subsides as I get warm, but when I stop, the real pain starts. This has begun to hang around for days.

I am having physio and he reckons it is a problem with a nerve running from my lower back down to my ankle. (called the saffron something possibly??)

Since physio the problem is actually getting worse. As I am having my lower back massaged I am now getting back aches as well.

I do motion exercises, use lots of ice and do yoga, but still nothing.

Does anyone out there know more than me? Has anyone had a similar problem or can recommend different treatment, say acupunture etc.
I live in the Cardiff area.


Thanks, Rachel