Hallow Dear, Many times when any intrauterine device is inserted, for first few weeks, may be till the first menses, the uterus tries to contract in attempt to expel it as an reaction to the foreign body causing cramps in the abdomen. These cramps can be managed by some anti-spasmodic painkillers. However, after the first menses, these cramps stop or may be become very mild. However, you are having severe cramps leading even to the excessive watering of the mouth and drowsiness. It is likely that the device has got infected. This will cause severe pain in abdomen. May be you are having some foul smelling vaginal discharge (either you might not have noticed it or it may start later). If you have no infection, may be that the uterus is not accepting the device and is continuously trying to expel it by forceful uterine contractions. In either case, the device has to be removed. In such case, you may better switch over to different type of reliable birth control method like contraceptive pills and/or condom. Please report to your Gynaecologist ASAP. Dr. Nishikant Shrotri