I have shifted from one SSRI to another for about forty years. Recently I was switched to Effexor, a drug I took several years ago that helped. Unlike then, I am now having terrible side effects; confusion, excessive sweating, tremors and anxiety. I don't know that my doctor knows where to go next. I am 83 years young and have fibromyalgia, peripheral neuropathy, back and hip pain. What is the best and safest antidepressant I might take? Any information will be greatly appreciated.