Sertraline is a life saver for me. I started on 50g at the beginning of December 2015, 3 months later went up too 100g, so been on them 6 months and feeling better than I have in years, as time went on I got better and with the increase better still, not numb to feelings either still have the odd downer but it does not last and I can push the brain cell back to positive, could not do that before either. Only side effect I had was nausea for first few days and I ordered some of those sweets you can get for chemo nausea and pregnancy nausea they worked a treat, though not so sure boiled sweets would not be just as good and a lot cheaper.
I do hope you start to feel better soon, I have been there so do know what it is like.