If your fasciitis does not respond to rest, off the shelf orthotics, NSAIDS, and achilles tendon stretching, you need to see a podiatrist or physical therapist.
A podiatrist can use corticosteroids either by direct injection with a needle or by ionophoresis. Ionophoresis is a process in which a corticosteroid solution is applied to the skin over the painful area and the medication is absorbed with the aid of a nonpainful electric current. I have seen both of these treatments work very well.
He can prescribe custom fitted orthotics or suggest night splints.
A physical therapist can instruct you in a series of exercises to stretch the plantar fascia and achilles tendon and to strengthen lower leg muscles, which stabilize your ankle and heel. A therapist may also teach you to apply athletic taping to support the bottom of your foot.
Someone mentioned toe raises for the tiabialis anterior.muscle. The tibialis anterior dorsiflexes the ankle. http://www.getbodysmart.com/ap/muscularsystem/footmuscles/tibialisanterior/tutorial.html
Toe raises would stretch the achilles tendon
Remember that plantar fasciitis is not the only cause of heel pain. Heel spurs also are common. Stress fractures of the calcaneus also occur in long distance runners. The tarsal nerve may become trapped and cause heel pain. This is similar to carpal tunnel syndrome that occurs in the hand.