I Am Struggling With My Sleep. I Always Wake Up

I am struggling with my sleep. I always wake up in the middle of the night and could not get back to sleep.
I am suffering from anxiety and currently taking circadian 2mg, amitrriptyline 25mg and sometime taking Zopiclone 7.5mg.
I have side effects from Amitriptyline, like dry mouth and weight gain. It seems that all these tablets are not helping. I need medicine to help me to sleep so that I could cope with my morning shift work. Please help.