Concerta and loss of appetite

My 6 year old daughter Started taking concerta about 3 months ago. Some things I've noticed are, loss of appetite and loss of weight.
She has had very noticeable academic improvement at school. She is concentrating better. At home I l see how she can go through mood swings and emotional episodes. She snaps all of the sudden and cries if things don't go as she expects. I'm not sure why this is happening. She is currently on the 36 mg. I really don't like having her on this or any other medication. It's very frustrating trying to decide what is best for your child.
She is also taking Singulair for her asthma and allergy symptoms. I was reading the reviews on that medication and they are scary! I don't know if her emotional episodes have to do anything with singulair or concerta med side effects. For now I'm definitely taking her off Singulair and see what happens.

My son was changed from Adderall to Concerta. He started having a lot of side effects on 18mg. I told the doctor and he doubled the dose to 36mg. In three days, he went totally out of control. In the following 4 days, we had 3 emergency room visits, two hospitals and two ambulance rides. Now I am facing lots of bills and no help from the doctor. My son's side effects were weight loss, loss of appetite, mervousness, fast heartbeat, unusual sadness, irritability, dilated pupils, hallucinations, twitching, temors, throwing up, yelling at me, nose bleeds, behavior changes, and dizziness. He now is off all ADHA medications. Please read what the side effects are and stop the medication if they show up.

My son is on concerta and has done much better ifocusing in school. I do see mood swings when the concerta wears off and he has been running his fingers through his hair and just told me he is pulling at the hair. Has anyone else experienced the hair issue with this?