sudden severe pain after almost 4 years -advice?

i had my iud inserted almost 4 years ago and i’ve been having problems off and on with it. a few days ago i noticed pain during intercourse and since then it has been hurting like a nonstop period cramp but 100x worse and this doesn’t feel like a muscle cramp it feels like my iud is stabbing through me. it hurts to sit and i can’t walk comfortably without being slightly bent forward. pain meds and heating pad aren’t helping. i checked my strings but i can’t tell if they’re longer/shorter & my cervix feels swollen. i tried calling my OBGYN office but they’re closed until tomorrow morning. i’m scared that it has moved or become imbedded. has anyone else ever gone through this? this is so painful i just want to lay in bed and sob.