Reflux? Gas? Colic? 🤷🏻‍♀️😩

My son is 3 weeks. He is on similac pro sensitive formula and this shit is supposedly good for gas. Well, he has gas constantly. He also seems to have a bunch of mucus. Sounds like he snorts all night long. Then I think the gurgling snorting is formula coming back up the throat and that’s what I’m hearing 🤷🏻‍♀️ any insight? He is a content baby until his stomach rattles off. I am so beat down tired from the constant up down at night trying to settle him and his stomach. He was born via csection so I’ve had people tell me he could still have gunk in his chest since he wasn’t born vaginally? I’m at a loss. My first didn’t do this.