Learned behaviors symptoms and conditions

I have a three year old son who has severe allergies. He's been taking singulair for 2 years on & off just in the allergy season. He started taking, singulair again in the beginning of April. One morning he woke up and both eyes were really swollen and red, I called his doctor's office and told them i thought he had pink eye, after 2 different drops and no change I brought him into the doctor's to see if it could be his allergies, and they agreed and started him on Zyrtec. I still was not impressed with the results so i brought him back yet again to see if we could see a specialist. Instead they put him on nasonex to try.
In the beginning of March I started to see a change in my usual happy fun loving son. He was scared to sleep in his bed, waking up in the middle of the night from bad dreams, uncontrollable screaming fits that would last up to an hour, saying he wants a Boo Boo. At first we thought it could be jealously over his new brother, or maybe something at his school.
Then i found this website and everything clicked, how scary it must be for a child to have these horrible thoughts and not be able to understand or stop them. What are the people at merck thinking??
Can any one tell me when the symptoms stop. He's been off for a week and we see some improvements. But he still has these fits with almost an OCD tendency to them (mainly when he's overtired), stomach pains, lack of appetite.

My son is 10 ½, and had been on Singulair for almost 6years to treat his well controlled asthma and allergies. We have had behavior problems with him for years, but it seems to have gotten worse this school year, when his grades (he is in the gifted program at school) went down the tubes. Our family has been to counseling, where it was suggested we put him on ADHD meds. We resisted, but things had reached the point that I was ready to give the NEW meds a try. ARGH!!!!! Then my sister sent me a link for a story about the teenage boy who committed suicide. This was several weeks before the Singulair/suicide stories were in the news. I did some research, and I started reading these posts. It was like I was reading descriptions of my son!! I talked to several pharmacists and none of them knew of any behavior problems attributed to taking Singulair. Talked to his pediatric pulmonary doc, he knew of no connection, but said to try taking him off. He thought the allergy/asthma would be OK since he also uses an inhaled steroid every day. Well........... I thought I could see a difference in 4 or 5 days, my husband thought I was wishful thinking! But, since then everyone in his life agrees, he is a different kid! No moodiness, no unexplained anger, more on task, sleeping better. I could go on and on. There is no doubt in my mind, the differences started when he stopped taking the Singulair.