Help with Plantar Fasciitis?

Hi guys. I have had plantar fasciitis for about a year. I have tried correct footwear, heel pads, foot orthothics, ice, rest, night splints (everything really). I refuse to have cortisone injections as they often make it worse and i hate needles. My doctor just says to rest it but i have already taken 4 months out of the football season and it hasnt made it any better. Has anyone else had this? What should I tell the doctor to make him do something for me? I am a teacher and high level football player and its holding me back. Thanks :)