Januvia and appointment

I thought I was tolerating Januvia pretty well, although it didn't seem to change my sugars much. However about 3 weeks into it I began to notice pain on my legs, especially my left. I can't really describe it as joint or muscle, it is just pain. I kept taking the medicine until it got really bad. I stopped taking the Januvia and the pain was gone in 2 days. I waited a week and started it again. The pain came back on the 2nd day. I have a doctor's appointment shortly and will discuss it with him. However, I'm not going to continue taking it.