Just so you know, plantar fasciitis is pretty common.

Depending on how bad it is (the cause), will depend on how severe the treatment.

Starting with the easiest = Do what punter16 said. Also what helps my women a lot (she has it & most of her family) is to roll your foot on a cold water bottle each night for as long as you can. I got her a brace as well but she never puts it on at night.

Next level = if it is bad enough, you need to see a doctor. They may give you a steroid shot that will help a lot. Her brother had this done and helped a lot.

Final level = If it is really, really bad. You may need minor surgery. Her sister had to have this done. This however will put you out of work for awhile.