Two weeks ago I got antibiotics for a uti. The doctor said he didn't know if it was a uti because the bacteria in the culture was low but he gave me antibiotics anyways. It got better for about a week but now I am having sever cramps that feel like period cramps. I have had a mirena iud in for about four years. I am just having bad cramping and I feel like I have to urinate all the time. Also I am having a lot of fatique and moodiness. I am going in to see the doctor tomorrow but am having a lot of anxiety about what it might be. Any ideas ?