I haven't been proven guilty yet, still have my drivers license and my MVR is clean at the moment. What's the point in telling them before any of that changes?
It's called being an adult. You messed up, you admitted it to us. The next step is to admit it to your employer.
Why? First,
it's the right thing to do.
Second, if you wait for your employer to find out and then they have to hunt you down, it will be much worse than telling them now. You will have this weight on your shoulders, waiting to be called into the office. It will affect your patient care, your eating and sleeping, if you are in a relationship it will affect them, etc.
Third, as mentioned above, there might be alternatives. You can be the attendant. You can work dispatch, do office work, etc. You can become an instructor and help with re-certifications. You can be the guy that washes the rigs, restocks them, cleans the toilets, etc. Failure to tell them now will eliminate the opportunity to do any of that.
Finally, if they can no longer employee you, ask to resign. It will look a
little better than being fired. If you
somehow beat the case, if you have a good lawyer, if the judge had a good cup of coffee, listens to you beg for mercy, and changes the charges to a lesser one, there's a chance you can continue to work in the field.