Just wondering if anyone has any ideas on the following:

When I have worked all day (standing) and sit down something happens with the heel and back of my foot, and when I stand up it is so so painful, and I literally cannot put pressure on it. It also happens often first thing in the morning also. After a little bit of walking the pain goes away, and it is okay.

Could this be a heel spur?? What exactly is a heel spur?
I was confused because the pain goes right up the back of my foot, not just my heel.....

It is getting really bad, so I prob should head to the Dr's anyways I guess?