My 2 week is fussy, gasy, projectile vomit. any moms with experience with this?

i tried to breasfeedpump milk for my daughter for the first 10 days. she was not nursing well, and i was not pumping enough milk. she has been getting supplement formula since the hospital. starting 3 days ago we have been doing similac sensative formula in dr. drown bottle. she always seems gasy and has about 5 episodes of projectile vomit since last week. this happened even when she was getting mostly milk. i have been giving her gas medicine at feeding, burping her frequently, keeping her upright after feedings. she doesnt seem content after feedings, crys, tenses up. she is only sleeping like 1 hr at time. she seems hungry all the time, eating between 3-4 oz every 2 to 2.5 hrs. i have called the doctor. she is having me see how the wkend goes then call back next wk. any advie from anyone??