In cases of substance abuse disorders, it is essential to seek help from a healthcare professional to address the issue. If you've been missing work due to the disorder, it's crucial to be honest and open with your employer about the situation.
Regarding backdating doctor's notes, it's not considered ethical for a doctor to backdate a note to cover periods of absence that have already occurred. Doctor's notes should accurately reflect the patient's condition and the dates when they were examined and treated.
If you are facing difficulties at work due to a substance abuse disorder, consider discussing the situation with your employer or human resources department. Depending on the country and workplace policies, there may be options for medical leave, counseling, or other forms of support that can help you address the issue while maintaining your employment. Seeking professional medical advice and support is crucial in such situations to ensure you receive appropriate treatment and guidance.