Wow, this is like my own experience.
Xanax for sleep after being prescribed it previously for dentist work. Then 10 years of panic attacks, night sweating , ibs paranoia that ibnoe know was multuple cold turkeys as i never put the pills and wuthdrawal symptoms together. All the tests and brain scans showed nothing. Told doctor i was gonna stop taking pillsand he said just stop but take a week of valium. Then the hell ensued. Anyway 6 years nearly over. Im prob 90%. Racing heart and palpitations stay with me. Maybe one day they will go away.