I have a one month old baby girl who since the ...

I have a one month old baby girl who since the age of four days has suffered from colic. Upon the doctor's advice, I have changed my diet (I am breastfeeding), tried Infacol, tried Donnalix, tried Gripe Water. I have changed my feeding positions. I have tried so many things but none of them are working. My little girl sleeps for no more than thirty to forty-five minutes before waking up in excruciating pain. Does anyone have any other ideas already not posted on this site. Any advice will be greatly appreciated.