I did make it to the post box and back. It was an ordeal but it had to be done. When I got down to my ground floor and out the door, I had to sit down on a step to ease the pain. Then I got across the street and mailed the payments. Standing at the postbox and waiting for the light was intense, so once I got back to my side of the street, I sat down again to let things ease up on my legs.
The worst part was dealing with the sympathetic neighbors; I don't want to stand on two painful legs and explain the situation, then hear their offers of help or suggestions. I know they mean well, and I do appreciate their concern. Just let me get through the mess and then I can be friendly.