Please HELP ME

My 2 months old baby boy is normally born  weight at birth was 3.5 kgs and now at age of 2 months his weight is 5.4 kgs  ,he was a great sleeper at age of around 4 weeks but after that he suddenly reduce his sleep now he is not sleeping more than 20 min. in day and night ,he sleep even smile like he is in deep sleep but wakes up after i put him on his crib ,i have tried to elevate his head but it doesn't seems to help well when he wakes up its just like he is not having much oxygen ,i have consulted many paediatrician he says that he feel some murmuring in heart beats i have his ECO next week but as he is gaining weight and feeding well i don't think its some heart problem.its only SLEEP problem that he wakes up after 20 -30 min.i tell his doctor that i think its may be acid reflux but he says that reflux is not the problem,i am very upset that no one is listening my worries i have given my baby little drops of calpol at night often when he not sleep after 4:00 am ,my English is also not very good but worries about my child's health is just like every mother.PLEASE REPLY ME AS SOON AS POSSILBLE.