I think the most important thing is that you stop drinking and that you have a plan to do so. Of course, shame is a huge part of alcoholism and it's often the thing that keeps us hooked. Try to step back from the shame and focus on doing whatever you can to stop drinking.
I think your depression will improve with alcohol out of the picture and your anxiety and PTSD will be easier to manage.
I don't know about things being reported to the Board of Nursing, but talking to your doctor would be a good idea. That way you could feel confident to completely stop drinking.
SR is a great support so I hope you continue to post and use our community to lean on.