What Causes Difficulty In Focusing And Anxiety After Taking Zopiclone?

I am currently taking Zopicolen for insomnia -- I am finding that I am having difficulty focusing and seem to be irritable at the slightest if issues. I fear I may also be depressed ?? Not sure if this is also related to this medication ?? I would like to discontinue using this medication however worried that it may have a negative impact on my sleep patterns and/or my general health. What would you suggest I start doing today and plan on to move forward ?