Find some shoes and or insoles that help and speak to your work about the problem, find strategies to take some of the strain off. Speak to your employer, ask about lighter duties or reassignment for a while or rubber matting where you work and a workstation stool or whatever is appropriate to your job and might help, as you say, the other option is ultimately you not doing your job either off sick or forced to quit. There are certain motions, twisting on the ball of the foot, moving away when you’ve been stood a while, walking on sand etc that triggered pain in my feet, I presume pain is synonymous with further damage. Figure out what’s causing your pain and consciously try to avoid those motions or develop strategies to help like stretching the foot and calf a little before moving off.

I’ve lived with foot pain for the better part of 20 years now, nowhere near as exquisite as a PF flare up but the dull ache in my heels, when stood for an hour on hard surfaces, is ever present whatever I do. Realistically I’d struggle to do a job that required a lot of standing.

First check with your doc that it is plantar fasciitis if you haven’t already. After that it’s gentle stretching of the lower leg, soft soled supportive shoes (flat skate style shoes with moulded foam soles suit me best though my problem these days is heel pain, probably related to earlier bouts of PF) and not doing the things that aggravate it until it’s healed. Painkillers will help you keep doing whatever triggered it but in my experience you’re just delaying the healing, find something else you enjoy doing while your feet heal.