welcome to healthcaremagic..
wel from your above depicted symptoms... it seems u have either severe contusion
on the heel bone called calcaneum
or you have fracture
of calcaneum.. in both cases u better go n get consulted to a nearby orthopaedician as soon as possible to rule out fracture...
for now apply ice packs, and immobilize it, dont put pressure on the affected heel while walking, take any painkiller if u have at ur home..
i hope i solved ur query..
i wish u a speedy recovery...