Servern, what happened to you was unacceptable but I am not a huge fan of lawsuits. Seems everyone wants to sue everyone else these days.
I'd report him for sure. If you want to make sure he doesn't do this to anyone else, reporting him will do the trick. I think a lawsuit is overkill. But that's just me.
I had a similar experience with a pharmacist who compounded a drug for me. This is not an addictive substance but was prescribed for a condition that I consider very private. He asked me when I dropped it off what it was being prescribed for and I told him. Wish I hadn't. But he wanted to know because the drug can be used for many things and he was concerned my doctor prescribed the wrong strength. Well when I went to pick it up, there were 2 techs and 3 customers in the small store. And this place is SMALL. It is a compounding pharmacy. Only has a counter in front with enough space to stand and pick up your prescriptions. I wne to the counter and he looked up and said "Jane Doe, right?"
I said yes. Well he said "I called your doctor and changed the script from name of drug xmg, to name of drug xmg. The strength she wrote was for someone with XXX condition. Since your problem is XXX, you should be on the dose I filled it for."
I was mortified. The three customers were standing there next to me and I wanted to crawl into a hole and die on the spot. He basically told these people what my name was and what my medical problem is and what I was taking.
Yes, I was humiliated. When I think of it, I still cringe. Problem is until I am able to find another pharmacy to compound it and get the doc to rewrite the script, I am stuck with this jerk.
I am not going to sue this man, but I am thinking of reporting him to the State Board of Pharmacy.
Whatever you decide to do, good luck to you. You were treated very poorly, unethically, and illegally.