Yall am i gonna die? 😭

Okay to tell you some backstory to kinda help this situation, Im 17 and I started my period when i was nine, i was put on birth control to help irregular periods at about 12 bc they were happening every few months or so. Well since then I've always had red, normal, not to painful periods but this time feels waaaay different. I am sexually active but i always use a condom. My period blood is currently black and has like, a tar consistency. Its also very clotted and im having severe nausea and cramp pains that ive never had to deal with before. Any suggestions of what this might be or if its normal or not? Im trying to get a doctors appointment but my mother is a cheap woman so its very difficult for me, so i need some advice!