When I was using Singulair I had trouble sleeping, then I had tro...

When I was using Singulair I had trouble sleeping, then I had trouble waking, even after 10 hours of sleep! I had racing heart rates, headaches often, my blood pressure was high, which it never was before, gained weight, felt like I was often on the verge of tears, mean aggressive and plain old nasty which in unlike me. Would have the craziest dreams or nightmares I ever had. I've been off for several months (10) I've been like the old me for quite awhile now. I had surgery in 2006 and had the usual testing done everything was normal. I am getting ready to have some surgery so my dr. ordered some test, an ekg which came back abnormal, it was explained to me that it was like my heartbeats didn't have a strong beat, maybe a heart attack or something. I never felt or knew anything about this. I am wondering if the singulair did something to my heart. I was on singulair for about 18 months. If it weren't for the ekg I would have never known this problem exsisted. I have no symptoms of any heart problems. I am a 52 year old woman who eats great and exercises daily (since I was in my 20's) . Anybody else have any similar reactions?