Hi,
My son is two also and was diagnosed with asthma about two months ago, although his first attack was back in june. He gets it when he's sick or running too much and has bad allergies to dogs/cats, anything outdoors, basically anything living (although we haven't done testing yet, he'll get rashes, etc.) We started pulmicort a few months back at the same time we started singulair. He has been more extreme in his behavior...like the littlest thing will set him off and he'll throw hour long screaming fits. Very difficult and I don't know if it's the singulair or pulmicort. The albuterol makes him very hyper, but not moody and when he was on albuterol, pulmicort AND prednisone he was a maniac!!! Anyway, I would try the just with a cold treatment and see how that goes for you. In the long run attitude changes are difficult, but better than a severe attack. Good luck!!!