Singulair and time of my life

I am 24 years old and I took Singular for 4 days. The doc told me that it would help my headaches. OH my god, It was the scariest time of my life. I the first day I could not concentrate, next came the short term memory loss. I felt like the lights were on, but no one was home! I thought I was going nuts. I would not advise taking this drug at all. I went to the doctor and he told me I had all the side affects of the drug. Other side effects I had were nausea and stomach issues. The anxiety that you get from this drug is horrible and you feel powerless. I stopped taking it after 4 days and it took me 2 months to feel better and now I feel 100% myself, but I worry about the children that have been on the drug for years. I don't know if a person can recover after that brain has been damaged that bady. For all the parents out there, if you see a difference in your childs' personality STOP taking the drug.