I'm sorry you had such a negative experience. It's extremely frustrating when we go to a professional, wanting real help, and getting a band-aid solution.
Ativan is a benzodiazepene. I was prescribed them for anxiety at 2 years sober and ended up eating them like candy, relapsing on booze, and ending up in rehab. Withdrawals are dangerous and painful! Toss them!
I understand where you are at because I have been there. You can quit drinking and go on to live a productive and happy life. Keep reaching out, keep sharing. You are not alone and we do care.