I have had PF in both feet in the past, as above golf ball (it will hurt),frozen bottle/can that fits insole and roll it, good trainers,walking shoes that are not to hard (gel heel things help) Ibuprofen, pain killers may help, massaging (again it will hurt).
The best thing for night was a piece of wood approx 30mm x 10mm x 200mm bandaged to the bottom of my foot not dead tight but tight enough that it kept it flatish then in the morning remove wood stretch the foot ( this stops the instep muscle from tearing each morning which damages it further ) this realy helped me and I found it alot more effective than the booty splinty thing.
Standing for a long time can affect it ie job, sport etc
Have you ruled out heal spur (x-ray) which also affects some PF sufferers, My doc said ‘cortisone injections’ just mask the pain and dont work very well (and yes they will make you cry like a girl)
I hope it gets better soon