Train of thoughts symptoms and conditions

I am so glad to know that I am not the only one that feels like I am in a "fog". I just associated that with normal motherhood stress, lack of sleep, full time job, and a husband who works several nights out of the week, leaving me to do most things on my own. I am normally a very active, get things done, kinda person, but lately I have felt like I didn't know if I was coming or going...and completely forgetting my train of thoughts and what I was working on. It's the weirdest thing. I have never felt this way before. On top of this, it seems as if I am bleeding every other week. My husband is completely frustrated! I tell him "How would you like it if your were bleeding all the time and had no control over when it happens?" It's hard on me too! I have had Mirena for almost a year now, but I am SO ready to be done with this "thing". Can someone explain to me why my head feels so "foggy" all the time???