Hi I.-
I am not sure what to say except that maybe you can't use birth control. My sister had all of the same problems trying to use the pill and she went crazy, literally, after bleeding, etc. The hormones made her wacky. I then tried them, and at 23 years of age had to go off. Our periods were weird, the bleeding was abnormal, and our bodies and minds screamed in the process. We both went off of them and while my sister still has longer periods (she just quick breast feeding 2 months ago) she is no longer all over the place and the bleeding is pretty regular, though heavy in the middle. Mine has since gotten really heavy days, but all the other effects are gone.
I really think that if you are wanting to not have another child soon, you should use condoms and vaginal foam. I know it means you have to be methodical when it comes to sex with your husband, but neither my sister nor I have had children that were unplanned and this is all we do. All forms of birth control are off the table for us.
Anyway, see your doctor, but please try not to put too many things into your body. It knows when something foreign is not supposed to be there and seriously I think it pushes it out. Sounds weird, but I really believe it. You doc should be able to give you other alternatives, too, if you still really want the IUD or something similar. With everything out there, you can get the depo shot, or the implant in your arm.
Hope this helps
-E. Mc