Plantar fasciitis can be a bear. I've had it twice.
Two tried and true methods to relieve are:
Keep the foot of your bed covers very loose. This stops your foot from too much Plantarflexion (angle increase). This is especially true if your first step out of bed is painful.
The other method is direct massage of the fascia using a rolling device. I have one that has little nubs all over it and provides blood flow to the affected area thus decreasing the healing time.
Once healed make sure that you perform Dorsiflexion and Plantarflexion stretches (as S&T described) prior to vigorous exercise like running, pickleball, basketball etc.
More treatment options:
http://www.mayoclinic.com/health/pla...508/DSECTION=8