I really feel for you.
Having taken a few ADs for various reasons (mainly pain control and PMT) the only advice I can give you is that it's very unusual to feel good right away and very unusual not to get initial side effects of some sort. As with hrt, I really think you need to stick with one and ride it out for at least 3 months. Otherwise, you'll never feel the benefits beyond side effects.I remember feeling hideous on all of the ones I've taken at one point or another, but within a month or so, I'd forgotten those feelings. For me, Citaloprim was the easiest to take (after few weeks of side effects) and easiest to come off. Duloxetine was the other end of the scale - but that's only my experience - and I took a much higher dose than you for much longer.
Dont be afraid of the link I sent you. There are lots of positive experiences and good advice on there too.
Are you allowed hrt patches with your syndrome? They have been shown to help depression at a dose when they are suppressing ovulation (100mcg +). Equally, have you tried alternative therapies like St Johns Wort (dont do this at same time as taking ADs without doctor's consent though). What about CBT? I think it can be helpful, though I am not sure how helpful it is for hormonally induced depression/anxiety.
Hang in there x