I had the same issues with my voice. Air escaping and sounding like I had a clothes pin on my nose. I’m two years out and my friends tell me that my voice is back to normal. Doesn’t seem normal to me as I have difficulty regulating air when I speak long sentences
I had a tonsillectomy and 6 biopsies and then back to surgeon for lymphnode dissection (18 removed with two cancerous) and TORS surgery to remove residual. The voice damage came from the robotics surgery behind my removed right tonsil. Then to 20 rounds of radiation and 2 chemo. My weight is back to normal and energy is recovered. It will seem like forever but your voice will be fine!!!