I have a friend here a work with exactly your same issue.
His ortho told him that it was inflamation of the ligament and gave him some Voltaren cream for it(anti-inflamatoty) the cream is like Celebrex but who wants that!
Anyways, If you like I could tell you what I do when my bad ankle gives grief(sprined many ions ago and it never healed properly and it bothers me from time to time).
Well wether you like it or not here is what I do.
Head to Amazon and look into Tropicin cream( a little pricey if you ask me but is all worth it to me).
Also look for Tubigrip this offers very mild compression and I like it because allows me to move freely without being too constricted.
I used the cream morning and night but you could use more often. It's completely safe as is made with natural herbs.
In the morning I use the cream only and at night I used the cream and the tubigrip to sleep in.
The method I use works wonderfully for me the pain goes away in a day or two.
There is also a book you might want to look at it is by Nicholas A. DiNubile and it's called Framework for the knee.
Good luck my friend I hope you find relief soon.
PS
I was just thinking you and Nick run pushing a stroller and you both are having some issues...uhm.
Thanks so much Dama! A friend in need is a friend indeed. I'll order that stuff presently. One more thing, when do you think I should start running again? As soon as the pain is gone? Or should I wait a bit after that to make sure it's healed completely?
P.S., I just walk with a regular, tandem stroller, and only once or twice a week. I resold the jogging stroller a few months ago. Just didn't work for me--felt funny not to use my arms. Plus it's kind of awkward on bumpy sidewalks and not really good for the boy to just sit there on the longer runs, it seems to me. Nick runs with one because he has no options right now.