What you need to address is the causal factor

1. If you are overweight then address dietary & exercise changes.
2. If sport related then rest & stretching as well as rehabilitation exercises are required.
3. Look at footwear & it's affect on the PF also. NO stilettos for a while!

This can easily turn into a chronic condition for the effected foot but also be indicated in causing problems with the unaffected leg due to the way it changes stride & feet placement when walking.
If you haven't addressed exercises then read this and discuss with your Physiotherapist.
http://www.plantarfasciitisbraces.com/plantar_fasciitis_stretching_exercises.html

Herbally, we recommend the Athletes oil massaged into the foot daily.(this is a great oil for all aches and sprains but don't use on broken skin)

As an internal support to strengthen the ligaments, connective tissues & reduce inflammation. This is a long term treatment, please consider a 3 to 6 month program for this condition.

Treatment for Bursitis, Tendonitis and Spurs

Athletes oil Herbal Treatment