I have been on SINGULAIR for 2 months now, I am a very active per...

I have been on SINGULAIR for 2 months now, I am a very active person, I do lot of sports. First thing I noticed was severe tiredness that affected me during practicing. Sleep disturbance and insomnia became very common, I had to shift from ZYRTEC to BENADRYL to be able to sleep. Last week I did a blood test, the scary thing was elevated ALT levels ( almost 3 times the normal level ). I excluded all factors that could cause that. Nothing but Singulair. I have stopped it and I will go for a course of sylimarin and retake the test in 1 month.