just to let you know that you're not alone- my mom has had the sour taste recently. unfortunatley, i can't tell you anything about it, since she doesn't know, herself.
she's also on birth control pills which makde her suspect those. however, i don't believe she's every been to an allergist which she really needs to see (she's had migraine headaches for over 10 years now, if i remember correctly).
sorry for the lack of info.. but its out there.
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