Thank you for your query at DoctorSpring.c
I can understand your problem
You are suffering from nasal obstruction, blood stained nasal discharge, sneezing, left sided headache, eye pain, decreased vision on left side with squint.
These symptoms can be presentation of many diseases, it may be sinusitis or it may be separate pathology for nose and eye.
So now in young age you need not to worry about cancer but to get correct diagnosis we need to do few investigation.
CT scan of paranasal sinuses with orbital cuts.
It is not an urgent but you need examination by ENT.
Hope this was helpful,
Feel free to discuss further
Dr. Sunil Jalan