I would be tempted to give it a bit longer to settle. I've got one in, it's been in about 8 months now. For the first 2-3 months I did have almost constant light bleeding/spotting but then it settled down. I do somethimes get spotting for a couple of weeks at a time, but it's rare and that's all I get, no proper af's, so it's not a bad trade off. I haven't really had any other side effects though, so I don't know if they are likely to settle or not. Might be worth popping back to your doctors/family planning clinic for a chat and see what they advise.
xx