I too had a great fear of needles, surgery and doctors. Not so much now. You can do this as I did. Just take it one day at a time. It sounds like with the PET scan they are trying to determine where your tumor is? Short Story. Lump came up on the neck. I was diagnosed with HPV16+ OSCC in March 2023 through a biopsy. ENT Scope found the tumor at base of tongue. I decided to have surgery to remove. I had TORS robotic surgery April 2023. I had a right neck dissection as well with all lymph nodes removed and TORS surgery to remove primary tumor of 3cm at base of tongue. All margins clear. Also, I just completed 30 rounds of Proton Radiation 6 weeks ago. I did tongue, jaw and neck and swallowing exercises daily several times a day( On the way to treatment is a good time). There are tons of videos online. However, If you have a Speech therapist they can help you with this. As of today 6 weeks out of radiation I can still eat and drink. I cannot taste much and I have dry mouth. Acid Reflux. However, I am alive and my latest NavDx blood test showed negative/ non detectable. Overall I feel about 80% energy wise. You can do it!