because of moderate depression i have been since taking zoloft 50mg for a year and a half, i am am having daily aching of my muscles, swelling at elbow, knee,wrist and ankle joints, rather than having few intermittent flare ups of fibromyalgia. i thought zoloft was to help fibro., but now i am in constant discomfort and take tramadol for pain. is this a side effect of zoloft or all anti depressants? if not, would it be better to get on another drug? thank you