My new GP prescribed Singulair as a "better alternative" to manag...

My new GP prescribed Singulair as a "better alternative" to manage my asthma on last Friday. Becuase this is generally my "bad season", I didn't think anything of it and was grateful for something else to try. It was not until last night (Monday), after staying home from work feeling like I got run over by a truck that it occurred to me to re-check the side effects of this new medicine. I have terrible muscle aches, headaches, shortness of breath, and extreme fatigue. I am going back to my GP on tomorrow, and am throwing the rest of this stuff in the trash!