Thank you for your question. Although without being able to examine you I can not offer you the specific advice on diagnosis and treatment that you need, but I would try to provide you some relevant information about your health concern.
Erectile dysfunction and impotence are quite common with diabetic neuropathy. I would advice a regular monitoring of blood sugar levels, and EMG to check out abnormal responses. Further consultation to a diabetologist would help you to reach at appropriate treatment here. Hope this information proves helpful to you.