plantar fasciitis & stretching

A sports doctor told me I have plantar fasciitis. However stretching my calves and massaging my feet seems to make the problem worse. Since the problem started almost two years ago, the only thing that's really helped has been not running and using good motion control shoes (I overpronate). The pain went away but I wanted to be able to run--running for a couple minutes makes my feet tender for a couple days. Inserts didn't help a lot, at least not the ones I tried.

Anyway, I was wondering if this sounded like plantar fasciitis to other people. I tried some of the stretches last year but they didn't seem to be helping very much, and when I stopped, the pain actually seemed to get better. Same thing right now, after seeing the sports doctor. I stretch, the problem comes back. I stop, it goes away. And I still can't run. Do you think I'm stretching too far? Not enough? Usually I'll do calf stretches with a wall or a step several times a day and stretch until I can feel something. Rolling my feet around on something might help but I get that weird feeling of something loose in my foot, like the tendons or ligaments want to detach.

Has anyone else had this experience of the stretches only making things worse? What is the typical time to seeing improvements?