7 week have acid reflex? Lethargic?

Hi, im a FTM & my baby boy is almost 7 weeks old. Im taking him to the docter tomorrow .. But i think he might have acid reflex? The other day he got sick while breastfeeding, litterly threw up while on my boob.. So i held him to comfort him & he threw up in my bra & then i took him to the bathroom & he threw up in the tub .. I cant tell if it was "spit up" or "throw up" it seemed somewhat forceful .. & it seemed like alot at once, i didnt even know that much milk could be in my little babe. I thought maybe i over fed him ..? But then a couple days later .. Yesterday. I fed him & put him in his swing & he spit up a little bit, so i picked him up & took him to the bathroom & held him sitting up over the tub & he threw up again .. It deffinetly wasnt as much as the first time. But it has me so worried ..! ;,( i looked up acid reflex online & some of the symptoms i think my boy has .. Such as ; " frequent or recurrent vomiting " .(just explained above) "Frequent or persistent coughing" . (He does cough sometimes ..) "Choking or gagging with feeding" (sometimes he seems to eat too fast & chokes) ..