Has anyone's baby had any problems with dha/ara in the infant formula?

Hi, I was wondering if anyone has had any problems with the dha/ara in infant formula. My child has been having digestive issues since about 2-3 weeks old. She was fed in the beginning, but my milk never came in fully despite my desperate efforts :( So, we started her on formula. She has been having gas, gas pains, screaming, etc with just about every feed. She is pretty much miserable after just about every feed. We have been to two different doctors multiple times. She was diagnosed with acid reflux - we have tried two different meds - we currently have her on prevacid, but haven't really noticed a huge help. We have tried her on just about every formula made I think - regular milk based, lacto-free, sensitive, gentle ease, soy, alimentum, and nutramigen - all with the same results (and we are giving her time on each formula). She will do good for a few days, then all the symptoms always return. Then the Dr. said she is having gastric spasms and gave us Levsin drops. They don't seem to help that much though and I don't really like the thought of having to medicate my child just to feed her. The Dr. said that she doesn't think the baby is allergic to milk or soy because the hypoallergenic formulas would have worked on her, and she doesn't think that it is any malabsorption problems because she is gaining weight good. The other Dr. we saw said that he thinks that it might be something (a particular ingredient) in the formula that she has problems with. Out of ALL the formulas we have tried, the common ingredient is that they ALL have dha/ara. I am wondering if anyone has any input on these ingredients - I know they are supposed to be good for development, but I have heard of infants unable to tolerate them. We have an appt to see a GI specialist but the first available appt wasn't until May 20th, so in the meantime I'm just trying to get opinons on whether or not I should try the non dha/ara formula? Please help!!!!!