I'm glad the new pill is working better than the last one!

And yeah I feel that on the temptation to underestimate! I tend to use the Mankoski Pain scale ( http://valis.com/andi/painscale.html ) which is pretty similar to the one you linked -- its definitely helpful in helping me keep things in perspective, both in terms of not underestimating where I am on the pain scale and managing my expectations for myself when I'm in pain