Help please

31 day cycle, due period 4 days from now 
Horrendous back pain (sort of in the middle) travelling round to my ribs
 headache for 4 days
chocolate tastes burnt
hot then freezing cold
hard sore stomach
 and 2 vvvvvvvvfl ONLY when a light is shone behind it!! (Hasn't happened before, on same tests!)

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