If it's only been a month it's probably a bit early for what is such a painful treatment.
The treatment involves having an accupuncture needled pushed through your plantar fascia (at its most tender spot) many times, right down the to bone.
It's the "down to the bone" part that has you breaking out in a cold sweat. It really is rather painful.
The idea is that plantar fascia injuries tend to go "chronic" readily as it's hard to rest your plantar fascia. By poking a needle through the fascia repeatedly, you convert the chronic injury into an acute one which stimulates new blood vessels and all the good things that promote healing.
I had 4 treatment sessions at weekly intervals. During the treatment, my PF didn't
feel much less painful but the area of tenderness in the sole of my foot seemed to get smaller each time. (It took longer for the physio to find the point of exquisite tenderness each time). Over the following 3-4 weeks, the pain reduced greatly and I was able to start running again. During this period I also got some orthotics (free off of the NHS) so I can't hand-on-heart say the the periosteal pecking was definitely the cure, but I'm pretty convinced it helped.