Singulair and heart monitor

UPDATE: Today is the second day that I haven't taken Singulair and I feel 100% better. I am no longer experiencing the panic attacks, hallucinations, shortness of breath, ear ringing, leg cramps, etc. I went to the doctor on the 23rd and he was reluctant to think that any of this was caused by taking Singulair. I am now convinced that it was, since I haven't felt any of the symptoms I was having for the last few months. I am going to a cardiologist on Aug 1st and will have to wear a heart monitor to "rule out" a heart condition. I also have to get my ears checked because my doctor thinks this could be an inner ear problem. I will go through with all of these check-ups just to make sure that I don't have any underlying medical issues. Seeing how quickly my symptoms have stopped after going off of Singulair makes me totally convinced that this is what was causing this in the first place. I am greatful that I found this site and read all of the comments from people having similar symptoms!