I'll bore everyone again with my story, ds2 was 10 weeks when it all started, he dropped his milk feed down from 6oz bottles to 2-3oz bottles but needed 10 - 12 feeds a day as he was obviously hungry every few hours.
HV didn't care because he was putting on weight
Sling was a godsend, we saw GP who prescribed gaviscon, didn't work, went back he referred us to paed doc at hospital, we paid to go private cost £200 for one meeting. Paed guy was fantastic, understanding, sympathetic etc. Enfamil worked for us BUT it didn't stop him throwing up completely. He threw up but didn't scream the place down.
Ds1 also had reflux, he projectile vomited but it never bothered him so we never sort any medical intervention but he was diagnosed as reflux baby. He finally stopped chucking when he was upright so from about 9-10 months.
Hate to say this but ds2 finally stopped being on the Enfamil when he was 14 months! He has never taken to cows milk, we tried, he sicked up, like possetting.
Ds2 slept upright on me in the day until he was 12 months old but did sleep in his propped up cot at night. This was personal choice.
Keep going back if your lo doesn't do well on Enfamil.