I have allergic asthma/copd. I use 2 inhalers: Pulmicort and Sp...

I have allergic asthma/copd. I use 2 inhalers: Pulmicort and Spiriva. A recent visit to Ga. with exposure to the acrid smell of the smoke from the forest fires affected my breathing terribly. Took Singulair for 10 days. My breathing vastly improved. However, on the 11th day, I awoke with severe leg cramps, toe cramps, and the beginning of a rectal irritation. Are these things a common occurence and why are they not mentioned in the official side effects listed. I have stopped taking the Singulair. Is anyone else having these problems?