Pain as caffeine?

So as last night wore on my shoulders, chest, and back became more and more sore from yesterday morning's workout. ..so much so that it woke me up in the middle of the night and kept me up for almost 2 hours until I finally gave in and took some advil. My word.
        Now this morning I awoke with my alarm at a cheery time of 4:44am and went to cycling class, again. And my chest and back and shoulders let me know they were there and not happy about it all class long, and when I went to the store to find a new hairdryer because mine decided to die, I could barely hold my 20lb purse on one side for more than one minute at a time because it hurt too much. ...just sad.
        And as I was walking around Wal-Mart I heard a district manager or some higher-up going on and on about how the cashiers need to help out the service desk or something, and all I could think was "stop! stop complaining and being bossy its making my shoulders tense up, and that REALLY hurts today." but if I had said that, I might never be allowed back at Wal-Mart again. Although that might be a really good thing for the amount of stuff piling up in my house...
       So thanks Heidi for pushing me yesterday, I shall think of you everytime I use my arms, at all. And to my hubby, for annoying me enough to make me try heavier weights. :) And pain, thanks for keeping me awake today so far, you are much more consistent and effective than caffeine.