Hello and welcome to health care magic,
What your friend needs is not herbs but proper control of diabetes
and complete removal of all the worms in the nose either in sedation or anesthesia
This condition is called maggots in the nose and is very debilitating to the person and the most common cause of death in this case is suicide
due to depression
. So you must act in haste and get a CT PNS done to know the extent of damage and get an expert ENT consult as soon as possible who can remove them completely.
You can get back to me on this as I have good experience in treating this condition. We can even sedate the worms with camphor or ether and remove them one by one. It is very meticulous process and you must have lots of patience. But it can be cured and controlled so do not worry.
Dr Sriram Nathan