right submandibular swelling

I saw my GP with a right submandibular swelling over 12 months ago. He dismissed it as nothing to worry about but recently it has started to be slightly tender and is quite large at times and always hard. It is difficult to feel as it seems to slide back into the tissues of my neck. I also seem to be tender along the armpit side of my right breast and along the front of my chest. Am I causing the extra symptoms by anxiety or should this be checked out again.I am 62 year old female and I don't want to waste my GP's time by going back again.