From last month I'm facing a blocked nose,. After sun set it getting worse,.. at night I couldn't breathe at all,.. only breathing from my mouth,.. no throat pain, no runny nose, no cold, no caugh, only blocked nose, I'm using otrivin spray every night to get rid off from this problem,. One dr.prescribed to take Mondeslor tablets but it doesn't doing anything,.. Don't now what problem is this,.. pls help me