Stage 3 glottic cancer T3N0M0 treatment options

Hello everyone - I was just recently diagnosed with stage 3 glottic cancer ( squamous cell carcinoma) the tumor is on my right vocal cord and it is fixed - not moving. I am a Navy veteran and am been treated at my local VA hospital. The treatment been offered to me is a full laryngoscopy - due to concern from my cancer board that the tumor is spreading to nearby tissue; I have an MRI schedule for later this week to confirm any spread. I did have a PET scan done 2 weeks ago and the results showed that there is no metastasizin. If the MRI shows no spreading than chemotherapy & radiation will be recommended. Otherwise I am a 44 year old male who is active & exercises regularly with no other ailments but this. I am doing my best to stay positive and have a great support group but I have to admit this news has devastated me and left me scared on what's to come. I don't want to lose my voice box and am researching as much as possible for possible outcomes and treatments for this type of cancer. I would greatly appreciate any opinions of anyone who has gone through this scary situation and anyone who has beaten this. As of right now I am leaning more towards chemotherapy and radiation to preserve my voice even though my doctors are recommending a laryngoscopy.