Hi Keren,
In my dd's case she would scream and not sleep until 4:30am every night. Everytime she screamed I would put her on the breast, thinking she was hungry when in reality I was making her pain worse due to her alergy (I used to eat lots of cheese and other milk products). In week 5 (the specific day I started EASY and held out 3 hours for feeds in the day and night) she immediately cried/screamed less and actually slept at night waking for 3 specific feeds. In week 7 she became a much happier baby and all screaming stopped because I eliminated all milk products out of my diet and started the Oval Drops which helped her burb. I think it was around week 10 that she was able to burb really well on her own and I stopped the drops. Gripe water works well for many babies for gas as well. Chances are it's not an alergy in your dd's case but more gas and perhaps the letdown.
Count her wet diapers, if she's having 6 or more she's getting enough milk from you. If she wasn't getting enough she would get dehydrated and would not have enough wet diapers. If you're feeding on both sides try getting a burp out of her after she's done on one side. Make sure you leave her on long enough on the first side to ensure she's draining the breast and taking the hind milk. If she's sputtering while gulping you may have an overactive letdown or oversupply.