what is happening with me? help

TMI!! Im 5 days away from my period, I've been switching between diarrhea and constipation, I have backache and acne, also idk if I've been feeling cramps for some moments but I don't know if it's just my mind playing games with me, my cervix is switching between hard and soft and today I think it's higher. I haven't had sex though, I've been just fingered after my partner ejaculated in my mouth but I'm freaking out, I'm just 16 I want to cry