anxiety
"I was suffering extreme anxiety, weight loss and insomnia due to a diagnosed medical condition.  I tried several sleep aids and SSRIs.  Nothing worked.  Because of the weight loss I was prescribed Remeron.  It was a Miracle for me!  I slept through the night for the first time in months, relieved anxiety and I started gaining weight.  Over time, my anxiety went away, but I stayed on because I loved having an appetite (I had no appetite for years).  I guess I stayed on too long.  After 6 years I decided I should get off.  I was dependent. I suffered flu like symptoms for weeks--nausea, exhaustion, gastrointestinal upset, feeling like low-grade fever.  I finally got rid of the nausea, but if I'm off for 2 weeks, the gastrointestinal upset creeps in.  I now take 3.25mg 1X week."