Singulair and tsh

I have been on Singulair for about 2-3 years during which time I have lost a considerable amount of hair. It is quite noticeable. My hair hairdresser said "this is not good" the last time I got a haircut. I also have bad dreams, fatigue and irritability. I want to try something to replace the sinulair for asthma, but am trying to avoid steroids. Any suggestions? Would appreciate any information on a class action suit if the hair loss is not reversible when discontinuing product..