What’s happening?🥺

My baby is 2 weeks and 3 days old and is fully on BM. these past few days he has been fussing during feedings , trying to find my nipple when it’s right there, latching and de latching and seems frustrated sometimes but there are days that he latches on fine without any fussing also it is difficult to get him to burp! and sometimes he spits out some milk when we put him down today while he was sleeping, he cried and coughed out milk from his mouth and some from his nose and his face was very red it sounded and looked like he was choking we carried him and put him in an upright position and he stopped fussing and is currently sleeping in my husband’s arm his last milk intake was 2.5 hrs ago. was wondering can it really take that long to experience a reflux? am still worried though , is he like choking or is this normal what if it happens in the middle of the night when we’re asleep? should i bring him to the doctor? i don’t know what to do🥺🥺🥺