I'll be 40 this year and I've had Mirena for about 18 months. I ...

I'll be 40 this year and I've had Mirena for about 18 months. I don't always get a period or it is very light - which sometimes is light for days/weeks - rather annoying really would rather just have a period and get it over with. Anyway I was searching on side effects and found this site. I'm constantly very moody and depressed and lack the umph to do anything. I can't say that I have gained weight or anything but it's not coming off very easy with diet and exercise either. I often feel like I'm going crazy and I snap rather easy. I'm not sure if that's the stress of having 4 kids or if there is something that I should do - like have this removed. After reading some of these posts I'm not so sure having this is a great idea...Thanks for any insight.