Hi M.,
"Colic" is just a word people use to describe a fussy baby--it is not a diagnosis. Some doctors use this term when they are not sure what is causing the baby to be fussy. There is a cause, and I urge you to press your doctors to find out what is wrong. The most common causes of colic are acid reflux and a milk allergy. Look for signs of reflux (spitting up a lot, screeching in pain and pulling in legs) and milk allergy (blood in stool).
My daughter had reflux and a milk allergy and screamed for the first four months of her life until she was finally properly diagnosed. She went on Zantac, and I stopped eating all dairy (she is breastfed). This made a world of a difference. At nine months, she still has reflux, but she has outgrown her milk allergy.
Also, the miracle blanket (www.miracleblanket.com) was a lifesaver for us. She woke up every one to two hours at night and was up for the day at 3:00 a.m. until we started using the Miracle Blanket--she then slept through the night at age six weeks.
Listen to your gut--is your baby just fussy, or do you think she is in pain? If you think she is excessively fussy and may be in pain, don't take "colic" as an answer. Keep pressing your doctors until they find out what is wrong and treat it. If you think she is just fussy, the book "The Happiest Baby on the Block" is great for techniqeus to soothe a fussy baby.
Good luck--I have been in your shoes, and it is not easy. It does get better!