I have one serious question 4 years ago I used to be a good singer, i could hit good notes and had a range high upto 'C' in the third otave. But ever since I suffered from sinus, I could not sing with the same ease. More to my frustration, it severely decreased the upper range of my voice and i can't sing the high notes...... Is there any treatment to retain my pitch (don't worry abt the voice I will take care of that)......Are there any therapies that can increase your pitch even more than before???