Hi everyone this is my first time in posting! 
I went to the doctor on Thursday as I had found a lump in my breast and have been having pain in my back above my shoulder pain. When I press on my back, it's like a knot and aches when I touch it. It's also started to radiate down my shoulder and upper arm

Saw the doctor and he felt the lump and he says he thinks it may be a cyst as it's perfectly round in shape and painful to touch. He also thinks I may have pleurisy in my lungs which is causing my back and arm pain. He's prescribed my antibiotics for both but he wants to see me again on 11th November. I am absolutely beside myself with worry as I haven't found any relief yet from the antibiotics. I know it's just a couple of days in but I'm just going out of my mind! I came across some stand up to cancer videos while scrolling on YouTube and I've now convinced myself it's the C word. My other half has gone out and I've just sat on the stairs and cried!
 

Has anyone had similar symptoms? I just feel so drained and lost. I don't know what to do with myself xx