I had a GP apt this morning as I found a lump in my left breast. I'm 38 and have 3 children (youngest is 12)

I've also been getting irregular bleeding, random spotting, bleeding and pain after sex, night sweats, lost weight without trying too hard, sudden back pain. My periods are only lasting 2-3 days versus my usual 4-5 and they are... Strange. 

Could this all be connected or am I overthinking?