I have never heard of a situation like yours, and I am so appalled that you have been left hanging like this. Have you asked that pharmacist about what you can expect when long term Ambien use is discontinued “cold turkey”? Would your doctor lower your dose and prescribe something to work in conjunction with the Ambien?
I was an insomniac for 40 years. About 3 years ago my dr. finally prescribed a safe combination of anti anxiety meds and I have been a 95% normal sleeper since.