Thanks for your responses (and for sorting the link - technofail). I know St John's Wort is known to benefit some, and I hadn't thought of it because, well, I wasn't expecting to go down the route of any treatment for depression, as I'm not strictly speaking depressed. Ooosabeauta, do you know what dose you were on? The GP said I'd be on a low dose, as I'm not depressed, but that I'd still have to come off it slowly. But any mood altering management approach concerns me because, as you say, I don't want to lose what makes me me, if I can do something else that will just cushion the extremes.
It's early days, and the placebo effect is very strong, but I've been back on the pill for a week and I haven't had a blow-up at DD1, or done anything unkind, in that time.