Similac total comfort

Kate
Anyone find similac total comfort too thin of a formula for their LO? I just switched from the sensitive version due to constipation and now she is screaming in the middle of almost every feed. She burps okay throughout the feeding but it seems like she is very uncomfortable. (At first I thought she had a sore throat). She is still hungry because she will continue to eat after she calms down but after a few gulps, she will scream again. This did not happen with other formulas. I'm wondering if the formula is too thin causing her to drink incredibly fast. She is spitting up more with this formula and tends to swallow it. I'm waiting patiently for a call back from the doctor to discuss it. Just wondering if there are amy other mom's experiencing something similar.