Well, there is your cause and consequence. You had a super busy week and weekend and last night your body told you OK, enough now, time to stop and rest. And you are on the right track - activity works wonders for anxiety, as you saw for yourself last (super busy week).
Another thing - being anxious and concentrating on a symptom or part of body causes all sorts of weird sensations in that part of body/magnifies a symptom threefold. It is a proven fact. Get some rest, than be active again - I am sure your spot will stop bothering you and you will not even notice it has happened.