Throwing up then wants to nurse again
DD would do that if she ate too much. I started limiting the amount that she could eat when she was fussy/seemed like she had a tummy ache. It resulted in her eating more often.... but much less throwup and she's easier to burp. I also try to wait 20 minutes after puke to feed again to let her stomach settle. Sometimes she won't let me but I at least try not to nurse her again right away.