Here's my backstory: I've had enlarged lymph nodes for several years – under my jaw and at the back…

Here's my backstory: I've had enlarged lymph nodes for several years – under my jaw and at the back of my neck. I recently had an ultrasound, they checked all the lymph nodes in my neck and found one that's reactive. The doctor suggested a biopsy, which scared me. She told me not to worry and to just try not to think about it. She sent me to get my teeth treated for 3 months, as there's an issue with them, and she suspected it might be the cause. I was fine for a month. But for the last couple of nights, I've started sweating. I looked it up online, and it says it's 100% cancer. I've made an appointment with another doctor at our oncology center for an ultrasound on November 2nd. Has anyone else experienced night sweats like this? It was fine yesterday, but I was sweating the day before yesterday and again today. I'm really worried.