anxiety
"Following surgery for prostate cancer, and 3 months later possibility of duodenal cancer ( biopsy tested negative) however surgery recommended; I was having severe anxiety & panic attacks.
This lasted 3 1/2 years, during which I tried numerous SSRI's & SNRI's all with no effect. In fact it made it worse, e.g. Suicidal ideation, greater bouts of anxiety, headaches, diarrhea. Ativan did help significantly, but all the negativity started to raise my anxiety just taking it. I finally jut took it despite all this negativity. Thankfully, my p Doc continued my prescription and I was able to live a better quality of life. 
I then was asked to try an "off label"
Medication ... Gabapentin. After 2weeks it did wonders!! Highly recommend!!"