Could Mood Swings And Tiredness Be The Side Effects Of Zopiclone?

2 Days ago I took 4 x7,5 mg pills of zopiclone ( I don t even know for what reason), yesterday I took 1 (as i was unable to sleep). Today I noticed myself being extremely moody and tired, I have some trouble breathing (not very noticable) and some uncomfortable pressure in my chest area . I did think that I would be fine after sleeping it off, but I m not sure anymore. Is there anything I should be seriously worried about?