Kudos to you for working through the pain!
I am sitting at my desk at work and feeling like it would be so much better on my body to be at home in bed, so I completely understand what you are saying!
Honestly, I haven't figured out if its really worth it to fake the smile any more... I sort of want my coworkers to see what I am going through, might ease up some of the dirty looks they give!
Good luck, hope today is much better for you!