I agree w/ the PPs...I think that it's gas rather than colic.
My first was a happy baby who sometimes experienced this...I would pump her legs for five minutes or so & the pain would pass. (But isn't it awful, the look on their face and the squirming?!)
When my 2nd was 5 weeks old, she started screaming...12-14 hours a day. NON-STOP. By the second day, we started thinking colic & I eliminated everything but bread, water, fruit, etc. By the weekend, the screaming was reduced to two hours, from about 6-8 pm. I d/n eat/drink any dairy for the next six months.
One of the Sears books has a box on "foods to avoid." Onions, garlic (except garlic powder), dairy, peppers & broccoli seemed to be the big issue w/ mine.