I have snoring problem from almost 10 years. Very big snoring and I open my mouth while sleeping. In my childhood I had allergiy bronchitis. I had medication for lungs allergy. I always feel my internal nose airways patially closed inside and also inside the throat I feel something obstacle is there while making a normal swallow. Even I feel difficulty for breathing  also while taking breath with nose. I use mouth sometimes for breathing. My snoring is not a normal snoring, it's too noisy like a hippo. Please suggest the treatment and what kind of specialist doctors I need to consult. Thank you.