Reevaluation symptoms and conditions

My daughter had been on singulair from the time she was 8 yrs old until she was 14. This will sound as if I am a horrible mother but I just thought that she was a raging bitch. Without my knowledge, she stopped taking her Singulair for a few months and she became a different person. She was so sweet and loving. One night she came in my room having an asthma attack and I asked her if she was taking her meds, she admitted that she had stopped taking her singulair and I got on to her and immediately got her prescription refilled. Within a few days of taking the singulair she turned into a raging, screaming emotional wreck, a TOTALLY different person. I feel so bad that for 6 years of her life I put her on medicine that caused her to have screaming, uncontrollable tantrums, and severe mood swings that caused her to be miserable. It does seem to be the only thing that effectively controls her asthma symptoms but the emotional havoc that is causes her and the people around her is not worth the benefits. We have an appt. with her doctor to see what other options we have.

Yea, ive taken this drug off and on for sinus infections for a couple of years. I wonder if this drug wasnt responsible in part for my sudden arythmia (untimely heart rhythm) and tachycardia (heartbeat over 100 bpm)... but on to the side effects ive gotten over the years. Basically ive noticed a feeling in my upper stomach like if i had almost acidic Gas or something, I get to feeling semi lightheaded and disoriented, Tired yet at the same time hyper which is odd.. like my mind is willing but my body isnt. Overall I feel malaise (feeling of slight illness)... think im dieing sometimes when on it! Heart Palpatations (when the heart is a little slow and then speeds up to catch up pumping a larger volume of blood through at once which is basically what it feels like... something hitting your heart from within). Anyway overall the drug is aweful... I took one today hoping it wouldnt hurt me too bad so i could get rid of my Ear Effusion(middle ear fluid), and my sinus blockage. I would suggest a reevaluation as well, I thought i was the only one getting all of these side effects for years until today. Go figure.