Hi there - I'm popping in with a nagging area of pain that would be nice to get rid of!

I've recently been doing some trail running. I have been getting a pain in my lower left leg. I'm not an anatomy expert but it seems to be in the lower area of the Flexor Digitorum Longus, on the tibia side. The pain is rstricted to above the ankle, and there is no pain on the sole of my foot or my toes. It usually begins the day after a run and lasts up to a few days. In those days afterwards, even walking 30-40 minutes can flare it up.
. A run with a very steep hill seems to be a guarantee to bring the symptoms on.

[FONT=verdana]I run in Vibram Five Finger shoes but have had this problem mutliple times over the years using various shoes. I do have a good amount of pronation on that foot as well. I read
TRAIN OUT PAIN: Claw Toes and Flexor Digitorum Longus]this
article
which seems to accurately diagnose my situation. When I do the single leg calf raise test outlined, I notice that the toe beside my big toe curls/claws during the movement. The article suggests doing calf raises while focusing on keeping all toes flat.

Anyways, if anyone can chime in I would greatly appreciate it. When the pain pops up, I have to take at least a few days off from running and it is messing with my training. I have my first race coming up on June 9th and am hoping to be able to run in it, while keeping in my mind that I will still have 3 more races to go over the next 3 months.