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The soreness is due to prolonged vibrator use. So wait for a few days before you use it again. Yes, the response to vibrator can be this high, and some women do experience this high orgasm even through intercourse.
Since you spot inbetween, please consult your gynecologist to find out whether it is due to hypothyroidism, cervical dysplasia, cervical polyps, cervicitis (infection/inflammation of cervix), vaginitis (infection/inflammation of vagina), uterine fibroids, hormonal imbalance as in polycystic disease of the ovary, and stress. Hope this helps. Take care!