Scared Ive got secondary cancer

Im so worried about pain at the base of my head on left side behind my ear.  I had breast cancer in 2011 - 2012 and it had spread to several lymph nodes under my arm and in other lymph nodes near collar bone.  how do I know if this is cancer and im not just being paranoid.  i phoned my breast care nurse and she didnt seem concerned and suggested go to gp. im scared and dont want to know but also feel silly and that im just a nuisance to them.  im in so much pain in my head and back but have a disc problem and that explains back pain.  what does the headache feel like, if anyone has secondary brain cancer please let me know what you experienced?

Hi I know it’s hard but I would take your worries to your doctor. My husband used to say when I got worried, go see the doctor to help put your mind at rest. Better to check it out as well to be on the safe side. It’s really hard though isn’t it, to know if something is to be worried about or not. X