So get the fear @InkPetal and I hope the Drs appointment is soon. I had a headache that lasted for days and had myself googling brain metastses. It was tension in my neck causing it, then worrying caused it to get worse. As the other ladies have discussed can be many causes and cording can develop later as can lymphodema. But you know all this. Not until you see a health professional will you relax. We are thinking of you and all get that anxiety and fear that never quite leaves us. I only tell my partner now later as he is dismissive of it, as he was with my first lump. I knew it wasn't nothing. He is supportive once slapped into his face but would rather live pretending all is well. Kath x