Jokester symptoms and conditions

We've been searching and wondering for the last 4 1/2 years what happened that November night that our 15 year old son suddenly took his own life. This boy was a fun, loving, jokester that was loved by everyone he came in contact with. We always had a stream of kids in and out of our home. He had just gotten his drivers license, went to homecoming and played on the football team.
Andrew had been on Singulair for about 3 years. He would get the stomach aches, leg cramping, odd sleeping habits and moodiness at times, but we attributed it to a young boy going through puberty. He also experienced the shakes which we were told were from the inhaler.
We had no dramatic warning signs nor was there a note. It all happened so fast that evening. He walked out of the house and 10 minutes later he was gone. Our whole community was in disbelief and devastated.
After speaking with Miller's and reading many, many testimonies on numerous sites, We feel we may have our answer to our years of wondering.