From what I know, you will be referred, as the employer is required to do so.
I would call TPAPN, but, if you can afford it, seek legal guidance first, with an attorney who specializes in license defense.
Next, start going to meetings, and just get a random sheet online, and start having it signed.
Get another job now, if you can, and start socking away money. The monitoring programs are costly, and you will need the extra cash. If you can find employment where you do not pass narcs, do so. Dialysis, psych, or a community clinic.
Good luck to you, come back to this forum for support from all of us.
Hang in there and do not beat yourself up. The BON will do enough of that for you!