I can understand your confusion - and the timing may be suspect, but a report has been made to the BNE and now it must be addressed.
The "motivation" behind it WILL NOT change the issue.
First, you noted a "sentinel event". You describe a medication error - then you note peer review and no discipline toward you except diabetes education. What was the end outcome for the patient? I hate to assume - but I suspect the patient either died or was left with serious disability.
FYI- there are certain meds that I always verify with another RN - INSULIN is one of them. Did your facility have a high alert/double verification for insulin? Did you follow their policy for this medication?
You admit an error where FIVE (5) ADDITIONAL units of insulin were administered - and this patient seized, became obtunded and _____ (outcome). You note that many others responded/cared for this patient and NO ONE picked up on the blood sugar. Wow!
I have no experience that supports that only 5 units of insulin could produce the clinical consequences that you describe. You noted that 10 units were indicated by sliding scale - at what point was the blood glucose checked after the "incident". Did someone do another finger stick or POC test, or did the routine labs show the glucose of 9? Was this patient a diabetic? You noted "high dose not unusual" and "resistance". You also note that this event took place 6 hours following med administration. What kind of insulin?
In any event - mistakes were made. But, EVERYONE will make mistakes. It just appears that this one had some serious consequences.
Just because "they" let you work without discipline and "allowed" you plenty of OT does not keep them from reporting an issue to the BNE. The patient had a bad outcome. I'm not trying to judge, but it does appear that a standard of care may have been deviated from - so...
You are a new nurse with less than a year at your first job. You admit a sentinel event. Your facility has reported the situation to the board for review. You will need to respond. I hope that you have copies of any correspondence that the facility had with you (write up) or that you had with the facility. Hopefully, you wrote (for your benefit) the entire event out with timeline - including the others involved in care of the patient. Memory is a strange thing.
YOU NEED TO TAKE THIS SERIOUSLY. Don't get stuck on the issue of WHY this was reported. Even if they reported you to "get even" for you quitting - the BNE will handle the "complaint" just like any other! I think you may have some problems. Heck, don't even answer the questions I have posted. I think I'd get qualified counsel right away. I'd look for a nurse lawyer. There is no way that I would go to the BNE alone. I am concerned for you.