The breathalyzer was 2 hours after the stop, but you failed it, and that's all that matters here. ( if anything, consider yourself fortunate you had 2 hours to wait to take the test, otherwise your blood alcohol level would have prob. been a bit higher.)
The xanax, you didn't order, was sent to u by mistake, but u still had it in your possession. That's all that matters.

U r worrying too much on the controlled substances possession. If those r your first controlled drug arrests,and u didn't have a large amount on you, then really, those r the least of your problems here.

It's the 3rd DUI for you. DUI laws are pretty tough all across the country these days.
You need an attorney who specializes in it.

I know u r here looking for advice/support, but we're all trying to explain to u , that u need to get an attorney.

Laws vary differently from state to state, as well as judges/prosecutors and their opinions on what sentencing to give, should u try to use the "rehab" idea or some other sort of plea bargain agreement.

I mean, yes, there are mandatory sentencing guidelines, but you need a lawyer who knows the ropes in your town ( so to speak )

As for the bashing you think u r receiving here:

When I was a little girl, a drunk driver hit our car, which caused us to fly out into an intersection, and hit another car.
We were ok, but one of the people we hit, had to be rushed to hospital for severe injuries.

Then , in high school, we lost a member of our class to a drunk driver.

We are not bashing you. We r just giving u the facts.
We are trying to help you.

U just can't get behind the wheel when intoxicated.

U may serve jail time for this one, I hope u realize this.
U will most certainly lose your license for quite awhile.

But, and I don't mean this to "bash" you, u need to consider yourself fortunate that u didn't kill somebody.

Please take this post with the intention of trying to help.
Not a bash.

Please get a lawyer, and don't rely on an internet message board for legal advice.

Good luck to u.