Can doctors have an idea if a nodule is cancerous just by looking at C

I had a follow up with my pulmonologist. He looked at my scans and said that he did not feel it was cancerous. I’m concerned about the 2mm increase however he said that is common and could be due to measuring etc. He ordered a PET and a blood test and if those are negative, wants to see me back in six months. Then he said that we would have to watch it for five years. I don’t know how I’m going to get through having to do this every year for five years as my anxiety is already debilitating thoughts?