Permanently get rid of heel pain?

I think i have plantar fasciitus, Both of my heels hurt now.. usually it was 1 or the other but now its both. And for some reason it only happens near summer?Ive had the pain since september 2008 and after that it went away (i heard if u do soemthing to long to fast this happens)well ive been active since then playing soccer every recess at school then. it jsut came back this june about jne 3rd or 4th it started again now in both heels and i want to get rid of it permanently. I dont play soccer as much so im not as active. I've read alot about it like if it hurts dont fight it. It doesnt hurt me that bad but it bothers me alot.Please help! thanks