I'm totally with Dr. Sears on the idea that "colic" is simply a catch-all term for baby pain of an unidentified source. The key here is there is a
source, and if you can find out what it is, you can help ease the pain.
My first DS screamed for hours and hours on end.

It was terrible! Sometime in the evening I'd start dreading nursing him, because I knew he'd be arching his back, pulling away, and screaming inconsolably. I lost many nights of sleep thanks to his crying and inability to sleep. I finally dug up enough information that at 9 weeks of age, I called the pediatrician and told him my baby had reflux. It was "silent reflux," and he didn't spit up constantly. However, I could hear the refluxing into his throat quite often, and if he did spit or I heard that, he'd start screaming. We put him on an antacid (declining the one to move things through the stomach better, for fear of side effects), and while he didn't stop spitting, he stopped screaming, and that was huge! (He continued to have some issues even after his 2nd birthday, though that's highly unusual.)
When my 2nd started exhibiting similar symptoms (more spitting up - 2-6x/day, but less screaming), I took him to the chiropractor. It made a HUGE difference! This time, we've already been seeing the chiro starting at 2.5 weeks old, and it does seem to be making a difference now.
Another potential cause of colic is food allergies. I tried dairy elimination with both of my older boys and it didn't help any, but for MANY kids it's the culprit. I've known some personally, as well as online. Of course dairy isn't the only big food allergen, but it's the biggest. It can be tricky to weed out ALL dairy (look at ingredient labels for things like casein and whey), but it seems that eradicating MOST dairy for even just a few days can make a big difference. The full effect may not be seen for 2 weeks or more, though.
So, I'd look at your diet and see if there's a correlation between what you eat and how he does. If so, try an elim diet. If not - and maybe regardless - go to the chiro.
Hope you're both feeling better soon!