I was on sert for four months in 2014. Started at 25mg and built up to 150mg. It gave me the strangest dreams and I'd wake up exhausted every morning. After a few months of this I was turning psychotic basically, I got impulsive and violent and felt sooo tired, also lots of shitty physical side-effects. I still stuck with it for the 4 months, wish I hadn't.
Also tried citalopram, amitriptyline, mitrazapine, bupropion in 2013/2014.
Every SSRI I've tried (and mirtazapine and amitriptyline) has disturbed my sleep and made me sorta manic. The first week is bearable but with time they really grind me down. The only thing that helps for mood atm, is Pregabalin but that makes me irritable if I take too much, and codeine, not ideal, but fairly sustainable.
Rant over.. take care with the sert, cer. It seems to work well for lots of folks