Have you seen an orthopedic doctor or a podiatrist? I'm have PF, and I'm not a doctor, but I do know that pain in your heel when you first get up in the morning is one of the classic symptoms of PF. You could start trying to help yourself with this by stretching your foot before you get out of bed. Point your toes up toward your face at least ten times. You could also try resting your foot on a baggie of ice after you've been on your feet. Definitely try to see a doctor for this because there are other things they can do, like orthotics and night splints.
Good luck!
Melissa