OK.........I'm not gonna give you the lecture you deserve about taking another persons medication, most especially a freaking benzo.
And no one on this forum is going to give you advice about how to get off it. Not because we're not nice..........because we are not qualified.
You need to get to your doctor and tell him/her what you did. (I fear the lecture will happen there!)
Only they can help you safely get off this drug.
I'm not a doctor nor a pharmacist, so I can't begin to address your question about your withdrawl. Just get to your doctor. And please don't ever do this again!
Let us know how you are, OK?
Peace
Greenlydia