Re: Obsessive negative thinking
SSRIs can worsen intrusive thoughts in the beginning. Its entirely possible that the sertraline could have triggered something.
Did you find coming off citalopram to be ok? I know that coming off SSRIs can result in anxiety, agitation and intrusive thoughts due to withdrawal. Mirtazapine doesn't hit the same receptors as SSRIs so it may not cover withdrawal. Just something to ponder.
What I find helps is to keep my body as sedated as possible. That means limited caffeine, chamomile tea, limited alcohol, enough sleep. Getting enough exercise also helps. I find that the intrusive thoughts are more likely to strike when I'm using a computer - here my mind is free to wander - though this is in the context of studying. If I had a job using computers like I had in the past I probably wouldn't have time to worry about my obsessive thoughts.
__________________
Today's mood rating - calculation in progress.