I really need some good advice about my baby?

He is 3 months old and has been suffering from 'colic' since he was 3 1/2 weeks old. He is fed. I watch my diet (still) to the best of my ability. I have tried zantac, so he doesn't have reflux (I think). Some days he is not at all interested in eating and cries at the . As colic is supposed to get better, his seems as if it may be getting a bit worse. My diet has not changed and I was told by my pediatrician that it shouldn't matter what I eat now, as long as it is not the obvious belly irritaters. Some have suggested that he may have a milk allergy. If so, could he be allergic to milk? Should I try soy formula (I really hate to do this---but whatever is necessary to help him feel better). The crying is ridiculous. He screams for hours on end and loud. If you were a bistander, you would think that someone had hurt him, it's horrible. I feel so bad for the little guy. His belly tightens up and his legs tighten. I can sometimes get him to relax them.