Hi,
Welcome to the ehealthforum and I am glad to help you out. Paragard is an intrauterine birth control device and using an IUD is often accompanied by pelvic inflammatory disease. Symptoms of PID may be like pain in lower part of abdomen, discharge from vagina, pain in back, nausea, vomiting, fever etc.
You need to go for blood test, urine test, histopathological examination and Ultrasound Pelvis.For this please consult a gynecologist.
I sincerely hope that helps. Take care and regards.