Hi there ~
I understand your concerns. It might be helpful to know that when you have a cold
from allergies, your nasal discharge usually help clear the allergens, however, when it is in excess the discharge usually crusts in your nose and hardens to stick to the sensitive epithelium of the mucous membrane
of the nose. When you blow your nose hard it sometimes bleeds, however this does not long too long. I also believe that you are doing your best to avoid this and it might be helpful to get a good treatment regimen from an allergist/immunologist who can help recommend the appropriate medications as well as test for the allergen that you need to avoid. I hope this helps.
Take care and have a lovely day!