My 14month old son has had a cough for a week and a half. It gets so bad that he chokes and has passed out a couple times. He uses an inhaler, I've used vicks, a humidifier, and he's had treatments nothing seems to help. What else should I do?

Call your pediatrician. The treatments done so far haven't worked.

Choking is bad and passing out is bad. Choking and passing out are really bad. And a 14 month old. He "uses" an inhaler?
Sorry but I am flabbergasted. Was the inhaler prescribed by a physician? Have you consulted a physician about the choking and passing out? How do you determine if he is breathing when he is passed out?
When it happened the first time, I am surprised that you didn't call 911. Human beings must breathe to live.

He was prescribed an inhaler at the hospital, and he holds his breath then passes out. I've told his doctor, and she says as long as he isn't passing out from a fall or anything it's normal many kids do it. He has been to his pediatrician done x-rays and his lungs and everything were clear, she said just there is not much to do for a child under 2 with a cough. I've also called 911 the first time he ever passed out, they also said as long as it's not over a minute , he acts hisself and has normal color to his face it is fine

This website provides some advice regarding choking. Unfortunately I am not a medical expert and can't say whether the information is accurate. But if I were in your situation I would take some training and learn the best possible procedures. If one waits a minute before taking any action that's one less minute available to act before damage or worse can happen.
I don't think I am overreacting here. I have had episodes myself (don't know for certain if it is sleep apnea or from reflux and neither do my Dr's) but I awake from a sound sleep (happens maybe once per year) and sit up in bed trying to draw what feels like the last breath I will ever draw. Can't talk, just gasp and luckily every time it has happened, in a short time I start breathing again. I am always amazed that even though we take so many breaths every day, missing just one seems to put the body and mind into a frenzy.

I do know that there are just a few minutes to act if breathing stop so being prepared especially when someone has a history of breathing problems is critical because the chance of emergency personnel arriving in those few scant minutes is a big gamble.

Infant first aid for choking and CPR: An illustrated guide | BabyCenter