I was diagnosed with plantar fasciitis last year. Got given exercises but nothing worked over about 3 months. Had the steroid injection just before Christmas. Can safely say that was one of the most painful things I’ve had, and very uncomfortable for a few days after but it’s almost completely gone. I have the odd twinge but I’m able to go back running and walking. If it starts to twinge, I stop and rest for a day or 2 then it goes.
Feel your pain though!