Reflux?

For the past couple of days my little guy has been more fussy than usual (he’s 7 weeks) I originally thought it was a growth spurt so I didn’t think much of it. Well during that fussy period gripe water has usually calmed him down pretty good so today I thought I would give him some since he was crying for no apparent reason and refusing to eat (even though I knew he should be hungry since he hadn’t eaten in a while). I gave him a half dose and thought he was acting better but after a few minutes tried burping him since he was still a little irritated. Well he threw up. Like a lot. And no it was not “spit up” when he spits up its white and not a lot of fluid. This was yellowish and was probably half an ounces worth. I’m waiting for the pediatricians office to open to call but thought I’d ask you ladies too. I’m thinking it has to be either reflux or something I’m eating (he’s breastfed). I think I’ll try cutting out dairy regardless of what the doctor says just to be on the safe side but I don’t know how long I need to be dairy free to see results so I know that’s what the issue is. I feel so bad for him he’s fussy even when he’s sleeping and was probably feeling so sick before throwing up. Have any of you ladies experienced anything like this? Advice?