what am I to do

Ok my LO screams everyday around the same time for about 10-15 minutes. It really scares me as I feel like something is wrong with her so I start moving her extremeties around as to make sure things are not hurting rubbing her belly her head and moving her body at every joint to see if I can find the issue.  So far I find nothing wrong.  I've used gas drops gripe water changed formula from similar advanced ( she spit that up terribly) to similar soy( that constipated her horribly but she didn't throw it up bad) to now enfamil gentle ease which she throws up bad but she has a BM daily.  I'm so confused.  Thankfully she doesn't cry for hours but it's still frustrating because I don't know the cause.  Doctor has her on Zantac for reflux which does not seem to help. Any suggestions are greatly appreciated. I'm willing to try anything. Oh and by the way she hates the swing she has a glider a sit up on floor seat play yard mat bouncer. Nothing soothes her.  Help!!!