I have been giving my baby good start formula, now i gave her enfamil. she puked lots, it even came out her nose. does that mean i shouldn't try again?

Not necessarily: The different cow's milk based formulas are all very similar in composition. It would be very unusual for one brand to cause problems when another didn't cause any. However, if she continues to have excessive vomiting and the formula is the only thing that's changed, try switching back. Be aware there are other reasons for vomiting. Look out for lethargy or decreased urine - signs of dehydration.