For a few days now, I have been getting this weird pain in my upper back when I swallow food. At first I thought it was heartburn, but it s really more general soreness than a burning sensation. I feel it sometimes when I m not eating but then it is very light. It only becomes acute while swallowing. Specifically, I feel it between my shoulder blades, slightly more on the right side than the left. Recently I have been taking Zoloft for social anxiety, but I don t know if it could possibly be related.