(ED) is a very common problem amongst men who have diabetes
affecting 35-75% of male diabetics.
Diabetics develop ED 10 to 15 years earlier than non diabetics.
Causes for ED are very complex and generally occur in the body affecting nerves,blood vessels and muscles.
Other factors causing ED amongst diabetic include
,blood pressure medications ( MODIURETIC can cause impotency in some males ),little exercises,psychological causes etc.
Treatment involves use of drugs like VIAGRA,CIALIS
etc but since these affect heart,these should be taken only after talking to your doctor.
Other treatment involves intraccavernous injection therapy etc.
Do regular exercises and bring your weight down.
Talk to a urologist
for the possible treatment option in you.
Last I would advise you to switch to other antihypertensives like ACE inhibitors or ARB's,instead of MODIURETIC as this medicine can cause problem in a long standing diabetic.