Milk coming out baby's nose!!

My daughter is one month today and since she was born she had milk coming out of her nose 4 times the moment I put her on the crib and it scared the hell out of me cause she looked like she was gasping for air. I usually keep her upright for like 25-35 mins after feeding.The last 2 days she slept on a bouncer, and I know that it's better flat, but I am so scared she's gonna have that happen again and itactually did. This morning I put her in the bed and after 10 mins I heard the milk in her nose and grabbed her, we then sucked some milk from her nose too. She is formula and breastfed. I know it could be reflux but the doctor didn't seem to be worried since she doesn't have any other issue like pain when eating, cause I am so worried about her chocking and it made me so nervous that I barely keep my eyes away from her. I am not a fan of medicine at this age but I heard some people say Zantac helped if it's reflux, cause I was wondering could it be over feeding too? Some people suggest changing formula too!! Sorry for the long post but I've been so stressed about this! 😏