Review for Plantar Fasciitis

I wanted to include that I was a runner for 20 years but haven't run in 5 years due to increasing arthritis. I've had plantar fasciitis on right for about 18 months but has been improving in last few months. 6 months ago I developed it on left and nothing seems to help. I've tried stretching, ice massages, over the counter orthotics, Birkenstocks Clark's and dansko shoes.its terribly painful when I first get up in morning, after sitting and after being on my feet for awhile. I've just about given up.