Nexplanon...no period to incredibly painful period

Jessie

So I've had the nexplanon implant for about 2.5 years. I spotted/had a period constantly for like 6 months....then long periods....then non for a year and a half. This week I am so bloated, my back is killing me and I feel like my body is being pulled apart on the breaking wheel and after a few days of that my first period in a year and a half shows up and it's only day 2 and I'm still dying. Nothing is touching these cramps. Has anyone had this happen before? I'm scared because when I had the IUD I had a. Last for 2 years before I could convince the doctor to take the damn thing out and I waited until it was regular again to get the implant and I really loved not having a period. I also didn't have sex that whole year and a half and started sleeping with someone a month ago....what gives