I Have Taken 4 Doses Of A 7 Day Treatment

I have taken 4 doses of a 7 day treatment of Macrobid. I am having sob with a feeling of not being able to get air in. It has occurred last night and again tonight. I feel like if I go to sleep I will not be able to breath. Could this be from the med? Iam afraid to sleep. Doesn't seem as bad in daytime.