Oh my! I've been having severe anxiety since i've started singul...

Oh my! I've been having severe anxiety since i've started singulair. The anxiety leads to shortness of breath which is extremely scary r someone with my medical condition. I had to have valve replacement surgery 4 years ago so I am very sensitive to any abnormal feelings I have. I took claritin d or about 8 years and I wanted to get off this drug because of the pseudoephedrine. I am off this drug starting tomorrow and will take regular claritin without the pseudoephedrine. The anxiety I had was so great I might actually consider legal action.