Already showing signs of GERD??😔

My son is a week old today. I posted whenever he was 4 days old about him eating every hour if any of y’all see this. He is showing signs of GERD now. I have to keep the poor little man upright for as long as I can, which is about 20 minutes at a time and whenever I put him down, it’s like his throat burns or something. My 3 year old had acid reflux but I was breastfeeding him. I really wanted to enjoy his first week of life and it’s been constant worry about him choking on his spit-up or not being comfortable😢😔 So he’ll eat about .5 oz and then fall asleep and then 10 minutes later he’ll choke and burp and spit up and then 10 minutes after that he’ll want more formula and it’s like an ongoing cycle all day. I think I’ve had maybe 5, 3-4 hours stretches of sleep this whole week with him. I feel terrible and get no help with him. He’s on the Gerber Soothe with the probiotic and that’s what helped my son whenever he had acid reflux that’s why I started him on this kind of formula. He’s also using the Dr. Browns bottles. I don’t know what to do anymore. I just want the little man to get a full feed in, which, I don’t even know what his full feed is anymore, and to not be in such pain. Any tips on how I can help him? I feel terrible for him. A week into life and it’s been terrible for him :(