depression
"I had taken Prozac for approximately 20 years when I noticed my depression was coming back and I felt it was no longer working for me.  I then started on the path of trying everything on the market; none of them seemed to work and that has been over the last 6 years.  Now I'm thinking about asking my doctor to switch me back to Prozac and see perhaps if it was helpful just being off it for while, give my system a break and maybe it will work again for me.  "