Help – what is this? Reflux? Cough?

My first son Ethan, now age 2 was diagnosed with reflux when he had a moment
of apnea in the well nursery, turned blue and was sent to the NICU. As
new parents my husband and I were just happy to hear it wasn’t anything
too serious. It was so long ago now I dont even remember what test
they did to determine it was reflux. My 3 month old Aiden never had any
breathing problems but exhibited some of the same painful signs as my
first son, but he also has symptoms my first son didnt have. Since we
brought Aiden home from the hospital he has had this weird cough,
almost like he is choking or trying to clear his throat. Sometimes I
can hear him reflux and swallow and then cough.

I explained this to our pediatrician and he was given Zantac. No tests to determine reflux were done. The zantac kind
of seems to help but has never gotten rid of this cough/choking thing.
Every time we see our pediatrician I bring up the coughing and
choking. The doctor listens to his chest, looks at his weight gain and
says he is fine. We just had his 3 month appointment this past monday
and she said he looks healthy. Im including a youtube link to a video
I took tonight. Aiden has been doing the coughing/choking thing much
more often, almost off and on the entire time he is awake and he has
been miserable.

http://www.youtube.com/watch?v=n9k8w7cENQU

Does this cough he is doing look like it is reflux related? Sometimes
he does this while sleeping as well. He is on 1.3ml of zantac.