My Baby sounds congested, weezy and hard time breathing while and after eating from the bottle

It seems every time while and after I feed my little guy he is gasping for air, coughing, weezing, spitting back out formula and sounds sooo congested like he needs to clear his lungs. I brough him to the doctor they said he sounded and looked good and that he just has little air ways because hes just a baby He is now 7 weeks and it sounds worse my family and friends always ask if he is sick because he sounds congested. back to bringing him to see the doctor, at the time he was not congested sounding, weezing or gasping. We burp him after every ounce and sit him up pretty good. He also gets fussy when he needs to burp always arching his back and moving all over its hard to burp most of the time. I think he might have silent reflux, allergic to milk base formula or azmah. Please help any advice or any Moms having the same problem.