I've been having throbbing pain running up and down my left arm for the past 5 days. In the first 2 days, I was feeling a pinching sensation in my left boob. This time last year I had the same throbbing pains in my left arm, I was told by a GP to get physiotherapy which I did, apparently I had a trapped nerve which was affecting my arm. I'm worried the pain may be linked to my lymph nodes. I also get bumps in my armpits that come and go. What could be causing the pain and the bumps ? Should I see a GP as soon as possible? Will I need an Xray?