Singulair Bloody Noses, Precious Smile, Anger Issues, Everyones Lives, Friends Children

Good evening all....I as well as you all have a story to share about my son. Kameron lived the terrible twos to the fullest and turned into the biggest sweetheart when he turned 3. But then his doc wanted to try something stronger for his allergies and thats when Singulair changed out lives. Kameron has been on that junk since about November/December and since then everyones lives around him has been pure hell. He turned into satan in the flesh. I have never seen as much anger as I do in my son. On a weekly basis we go through stomach pains, depression, anger issues, him not eating for days, many sleepless nights, and thats not even all of them. He has spit in my husbands face and called me very bad words (that nobody has ever used in front of him towards me), Ive walked around with black eyes from him (remember he is only 3), he has given me bloody noses and straight up told his dad and I both that he hates us, and doesnt love us anymore. We cant take him around our friends children cause he is very abusive and controlling with them. He shows no interest in the things that he once loved, like his toys and pets. We have taken him to the doc and have been told over and over again that he is just a typical 3 year old but a mama knows when something is wrong with her baby!!I havent seen my sons precious smile since this stuff has taken over him or even heard him laugh. Im taking him to a different doc tomorrow and takin all of your comments with me and I am not leaving his office till they do something for my son!! My thoughts n prayers are with all of you that are goin through this cause I myself now how hard its been..