I agree with Tuckamore. If you seek an attorney right off then they will immediately be defensive. If you can speak with the hospital representative and work this out that would be the best way to handle this.
This is the very reason I encourage everyone to obtain copies of their medical records. I am so sorry that this has happened to you.
Before you go to the extreme of obtaining an attorney I would ask for a meeting with a hospital representative. Be prepared to have your records or something in writing from the physician that refilled the pump. Explain the situation in detail to the hospital representative and ask that their be an addendum to your record.
If your blood work revealed a small amount of alcohol find out what the percentage was. Did you consume anything, like mouthwash that could have contained alcohol?
An "over dose" can be from anything. It will depend on how it is worded. In all actuality you did experience an over dose but it was not due to your negligence or actions. Of course you were "sleepy" upon arrival. That occurs in over doses. Make sure that your record is changed to indicate that this was not your doing.
In my experience medical records are only as good or as accurate as the person initially making the record and the transcriptionist. A lot could have been and is often lost in the translation. You would not beleive what I have read. Have you not seen "bloopers" posted in various magazines regarding medical notes or records.
If the hospital is willing to work with your that would be my first course of action. It is not legal to change a medical record but they can do corrections or additions. If you are unsuccessful in that route than I may seek a legal opinion.
Good luck and please let us know how this turns out.
Peace,
Tuck
Meet with an attorney and ask that he/she write a letter that be placed in your medical records documenting what you say occurred.