I took Zoloft for about a week or so and began having pain in my kidney. I'm only 18 and I'm 150 normally, and my metabolism is great, I eat healthy and exercise every day. When I started getting the side pains it came with frequent urination, slight burning and pressure (small jolts of pain in my right side). The doctor put pressure, did a million tests... nothing. She was speechless and couldn't figure out what the problem was.