Some hard/soft growth at lining of nose.

I am facing a lot of difficulty through right nostril which overall affecting my upper respiratory system, i can't take deep breaths My right nose at ethmoidal area has a very hard growth at lining of nose just below right eyebrow it's affecting my overall body as i can't take deep breathe and feel good and my brain function is also getting decline , i can't use my brain like other people of my age group. Moreover my right neck area my right jaw feels like muscles are blocked , when i tilt my head to right or move my head while lying or do some exercises like touching feet then airway suddenly obstructs and i start feeling dizzy and sleepy (specially in my right eye) But the most important thing is that the endoscopy is not able to detect that Why is it so , is it because my nasal polyps or sinusitis is located at sideways which can't show by an endoscope