My son is in second grade and has been on Zyrtec and singular sin...

My son is in second grade and has been on Zyrtec and singular since he was four years old. He was diagnosed with asthma and peanut and tree nut allergies. He has always been the sweetest kid. However, we noticed in first grade that he was spacing out and not always focused. he became easily frustrated, did not want to do his homework, cried for everything and gave up easily. This year in second grade we are noticing the same thing in addition to talking back, being aggressive with his brother, rolling his eyes and having a nasty disposition. He is negative and complains a lot. His grades have been suffering greatly. He rushes through his school work and does not pay attention or try. I am so happy for the reading that I am seeing on this site. My son is coming off the singulair and the Zyrtec first thing in the morning.