Hello,
The IUD rubbing on your cervix will not cause permanent damage. It will cause a bruise which can get infected (which is what is happening to you now) and bleed. Once the IUD is removed, you will need to take antibiotics and anti-inflammatory medicines. You can safely get another IUD re-inserted after 1 month.
If your husband could feel the IUD from the time it was inserted, then it is likely that it was not put in deeply enough. Occasionally, however, the uterine contractions (cramps) that occur during the periods can push out an IUD. This takes a few months after the insertion to occur.
You may not have any pain at all while the IUD is coming out. You will not even feel the movement. The uterus is not a very sensitive organ. Sensory nerve supply is very minimal - the reason why it can grow to such a big size during pregnancy without causing much discomfort.
The two main birth control methods that have their action at the local site and do not affect the whole body are condoms and IUDs. Other birth control methods that act locally are the vaginal sponge, cervical caps, female diaphragms - these are not very comfortable and the failure rates is also comparatively high. Pills as you aware, contain hormones that can increase the weight.
I feel that the IUD is an ideal contraceptive. Since you have had no major problems except that it is beginning to come out, I feel that you can continue with this type of birth control - just get this one removed, use antibiotics, wait for one month and then get a new one inserted.
I hope this helps.
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Experienced in the management of Pregnancy,Infertility,Menopause and all problems in Pregnancy and Gynecology