Singulair Stomach Complaints, Large Intestine, Small Intestine, Poor Appetite, Vague Complaints

I originally posted about my 9 year old son on January 5th. Refer back to this for the symptoms. He had his upper and lower endoscopies on the 12th, and the lower showed numerous ulcers in the large intestine and at the beginning of the small intestine. The doctor insists that it has to be Crohn's disease based on just this and the blood work, which showed eosinophilia and elevated sedimentation. He is insistent that this has nothing to do with the Singulair and the dosage change. It's just a coincidence .... He' in the hospital for a week now. Watch for those stomach complaints! His started with poor appetite, complaining that he was full when he had hardly eaten, and vague complaints about eating giving him a stomach ache. It progressed to occasional diarrhea. It got worse quickly after that, just a few weeks.