L.I.
Hi,
If you take your baby to a cranial osteopath this problem will be cured, at its source, very easily and gently.
Medicine from your doctor is most probably only treating the symptoms not the cause of the screaming and vomiting.
Feed her until she needs no more milk. That's the best way of ensuring she has enough milk. Don't starve her to reduce reflux. I have NEVER heard of a breast fed baby 'eating too much'. I strongly suspect your doctor really does not know why she is screaming and vomiting.
Breastfeeding is balanced between mother and baby, we produce exactly what and how much they need. If we have too much, babies just drink less making us produce less. Its a feedback loop.
My son screamed and projectile vomited. The cranial osteopath fixed it within 3 weeks and saved my sanity!
Good luck!