Hi,
The possible causes could be nasal stuffiness or congestion can be due to:
* VMR that is vaso-motor
rhinitis wherein one gets stuffiness on stress,
anxiety or such responses
* Hypertrophied turbinates
* Deviated
nasal septum with other problems as discussed above
* Naso-gastric reflex as you have a history of need to clean the nose after food
* The bluish discoloration can be due to the changes in nose if you are a fair skinned person
All this can be diagnosed well by the following ways:
* Clinical evaluation, ENT
Endoscopy by an ENT Surgeon, associated
CT scan and relevant blood tests.
Once a proper diagnosis has been done you will be treated specifically.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General Surgeon