Insident symptoms and conditions

My baby (1 yr) was just prescribed Singulair from a CHOP doctor. I am so thankful that I found this website. I certainly will not fill the prescription. I was hesitant at first anyway because he only had one fluke "asthmatic" insident that sent him to the ER (but has many food allergies and dog allergy). Anyone have any advice on where I should go from here? Honestly, I am afraid to go back to that doctor and they told me it would be very difficult to switch doctors at CHOP. Everyone knows CHOP is one of the best. It is so hard to get honest advice. Every doctor thinks you will sue. Or they're out to use you for their research. He thinks this was the beginning of asthma and it will get worse. It was a scary episode...first time I ever called 911 for one of my children. Breathing is obviously very important, but he never has any problems breathing otherwise (running, laughing, playing) Just got a cold that turned bad quickly. Should I prevent with meds.? My thought is to just keep the neb. and Albuterol handy. I hate giving daily meds. to a developing baby. My gut says to let God develops his immune system naturally. (Not against periodic meds. - So thankful for Benadryl!) Please help! Mommy of 4