Sounds like the PF was just the first symptom in your condition. You have now developed tarsal tunnel syndrome.
Wouldn't be supprise if you also have non insertional Achilles tenderness as well. - very common in runners who over pronate.

What is your aim here, to get better or be able to run? I ask because rest is key, if you commute using the legs ie walk regular - this wont be deemed as rest by the body and the condition will become chronic.
So to get rest, as much as possible, wear a boot type shoe to control daily over pronation or even a ankle strap if don't have boot. - This will also help the swelling as it will compress.
Ice is key to control aggravation.
Protocol = 5-10 times a day for as many days as it takes while resting (that means resting the aggravated foot not just to stop running)

For quicker results look for ultrasound therapy (great for
This condition expect a intense ache during treatment) or shockwave therapy (very good results). Once better our are going to need to be taught strapping tech, running orthotic (£100, don't get stuff from off the shelf) and possibly a strap.