I get all kinds of ovulation symptoms, some months, including a little nausea. If you think of your cycle like a rollercoaster ride, ovulation is the peak- you have the most hormones in your system right then and they're just about to drop off precipitously. If you tend to be sensitive to hormones or hormonal changes it can definitely make you a little queasy.
That sharp twinge is called mittelschmerz (and if it's just a twinge, be very grateful ;-P They can really give a kick when they want to.) It has to do with the egg erupting out of your ovary- there's no, you know, *opening* in the ovary to let the egg out. The darn thing just pops through the wall.
For what it's worth, I found that making sure I have enough magnesium in my diet (most people don't) has helped a bit with hormonal symptoms. Exercise is supposed to help also.
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