really sore

I am having extremely sore boob's not just my boob's but also my nipple area as well and I cannot sleep because it hurts so bad. and then cramping underneath my belly button area and towards my left side and also my back has been killing me so bad and I've been bloated some, I'm a skinny mini so IDK if I'm bloated a lot but I can tell the difference. I'm 9 days before my next period and I'm 5dpo according to glow. but can anybody tell me why my boob's hurt so bad, they started hurting this morning bad so I tried touching and poking them and I don't think that was a good idea because now they hurt worse and hurt with my tank top over them. can anyone tell me why or what is causing my symptoms or could be causing my symptoms