insomnia
"I used 10 mg zopidem for 7 years. It worked like a charm.  I went from 10 to 15 to 20 mg of this new stuff.  Nothing. I'm just going to have to go one week Belsomra and 45 mg mirtazapine and one week zolpidem. I had such high hopes. But doesn't get rid of my sleep anxiety."