Has it come back

I've found a lump below my collar bone and above my breast, it's a bit tender but that might be because I can't leave it alone. I'm terrified, seeing surgeon on Thursday.

original diagnosis was stage 1, so small it was only picked up on a mammogram. Margins were clear after surgery, no nodes affected, on tamoxifen, really hoped I was going to be ok.

Any experiences/advice.

thanks for reading x