Singulair and taking time

I have six year old twins who have been on Singulair since August. Things have been so bad I have considered putting them in counseling. The physical symptoms they have is dry, red eyes, stomach aches, stuffy nose, sore throat, cough, night sweats, body aches, itchy skin, cherry red cheeks and ears, and excessive weight gain. The other symptoms they suffer from are night terrors, sleep walking and reaching for things that are not there. Also anger, depression, very, very irritable they will cry over the least little things. They are doing well in school, but are crying every day they hate school and they basically hate everything. The teacher also tells me they can't pay attention. They have become very aggressive hitting each other and there brother and sister. Screaming and crying for long periods of time. I really started to worry when one of them said he wished he were dead. That is something a six year old should not even think of. I have four kids and I just thought it was family stress and it was because I couldn't devote enough attention to them. I had begun to think that I was the worst mother on the planet. With all these crazy things going on I never dreamed that they were connected. I really don't know why I goggled Singulair side effects, but I am so glad I did. It cannot be a coincidence that so many children and adults have the same symptoms and they all take Singulair. My children have taken their last dose tonight and I pray they will start feeling better. It is such a relief to know that there is a reason for their behavior it was so out of character for them. I usually do not reply to any posts but I feel it is important to let everyone know about this. I will also let my pediatrician know.