Singulair I have been taking Singulair for about three months. It seems to be giving me a really bad reaction in that the blood vessels in my mouth are really becoming pronounced and I am now itching and have severe lung pain. When I first started taking it it gave me monsterous headaches and enlarged a blood vessl in my temple so badly I stopped taking it for fear I would have a stroke, and the only resaon I began taking it again was worstening asthma symptoms. I want to stop taking it, but now am having trouble NOT taking it. I am afraid of this medication and I need to talk to my doctor. I wish I had never started taking it.