Orthotics are a big help,and Ice and stretching. My doctor suggested freezing a water bottle and rolling it under my feet. Don't try to work through it. There is very little blood flow to the tendons in your feet so anti-inflammitory treatment is only moderately effective.
I hurt mine in Karate and tried to work through it for four months, the end result was I had to get custom orthotics ($400), 18 months of pain,(I could hardly stand in the mornings), and finally when it was almost healed I got physio, and cortisone injected into my heels.
I still have to wear custom orthotics.