This is an excellent point of research actually to have nose bleed with chocolate milk.
but I think its just a coincidence.
you need to have ent examination, CT scan
of nose and paranasal sinuses
.,and a nasal endoscopy
All three tests are important and have there own value.
These tests will tell about any bleeding point,any bleeding granuloma
, or any prominent blood vessel which bleeds off and on
In doubt do reply