Howdy, folks. Pollen count here went through the roof, over 3,000, and I was dripping, wheezing and sneezing. In addition to Advair and albuterol inhaler, doctor gave me Rx for Singulair. Since taking the Singulair (2 weeks), I have had severe sinus headache (frontal), dizziness, really bad sore throat, and excruciating muscle spasms. I do not feel sick, no fever, just have these symptoms. I forgot to take the Singular for 2 nights, felt much better, then took 1 last night, and voila!, sore throat and headache are back with a vengeance. This stuff is SCARY!. Will see doctor Monday and will definitely stop taking this medicine.