Hello, Post insertion Merina IUD women do complain of backache, cramps, irregular periods, spotting between periods or heavier periods with stronger cramping. IUD use has proven to be safe and effective for most women when prescribed and inserted by a well-trained and experienced provider. However, chances of complications cannot be ruled out. One of the most serious complications that can arise because of an IUD is infection. It may cause PID if not treated in time. Lost strings is another complication, it shows that the IUD is not at the proper location or may also indicate serious issues such as expulsion, or perforation. Since you are hurting and are unable to stand, you are suggested to get clinically examined by a gynecologist to make sure the IUD is present in the correct location and to detect any complications. In the meantime, take analgesics, Acetaminophen one SOS when needed to ease discomfort. Yes, Merina may cause backpain. It is better to get the IUD removed if you are not comfortable. You can use any other birth control methods. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician