vomiting clear liquid

Amanda
My 7 week old (2 weeks adjusted) started vomiting clear liquid. Spitting up a little bit of formula isn't new for him, as it happens almost every day, but I've never seen him projectile vomit or it being a clear liquid. He's been a bit more fussy today and has moments where he will breathe a lot faster and then it will get really slow. He was just released a week ago for having rsv and I was told to look out for him pulling really hard when he breathes, which he isn't doing as hard as when he was admitted to the hospital. Currently I have strep throat and a cold and I'm just worried I made him sick again. I can't get ahold of his doctor till morning and I'm trying to decide whether I should take him to the emergency room or not. I was just wondering if anyone else has dealt with anything like this? What I found online was mostly with teething babies and he's definitely not teething this early.