I can really commeserate with your legs feeling like lead!
Mz Logan scooted past me fast as lightening and out the front door about a month after I got her. (Me bad). I knew where she would be, thankfully, at the school down the street where the trees are loaded with squirrels, Still, there is a lot of traffic. I tried to be as calm as could be (dragging my lead legs). I called her, stood still and for the first time ever, (and since) she ran right to me and sat in front of me (happy as a clam of course). All I can remember is my head spinning and heart pounding.

I'm sure glad all turned out OK with Rusty. Hope your heart beat is back to normal.