First, you are a great mom cuz you are trying to help your child.
My daughter was never diagnosed colic, and she was I say. We switched Doctors after the fact. We bought a gas relief medicine, did not work. She even took Zantac, which helped a lot. I stopped breastfeeding and switched to formula, and this did help a little. And by the way, she was 9 or 10 weeks when this started. Same thing, Dr. told me no way was she colic. And same thing, this started at 4 or 5 pm, and lasted all evening. or for about 4 hours at a time. I had to hold her the entire time, if she was set down for a second, it was worse. My poor husband rarely saw her happy. She would arch her back, like she was uncomfortable, and would just wail. In the end, we just waited it out, 4 of the longest months of our lives. We have a wonderful Dr. now, the Pediactric Specialists in Crytal Lake. There could be a problem with milk too. Could be anything. I even went as far as taking her to the hospital to be checked out, and they found nothing. I would look at colic babies and try some of their technics, I really feel this will be helpful. And do try differnt dr's, a second, third opinion may solve this.
I hope this works, and if you can, please, have someone else come in and hold him while he cries, so you can relax for 10 whole minutes, and go longer if you can. Or even set him down and take deep breaths. I know how you feel and its just awful. I wish you all the luck, and feel free to email me anytime to talk. ;-) ____@____.com