I have fever, back ache, occasional mild cramps (im not on my period), throat pain. I had diarrohea before I caught the fever. What could be the cause?

Viral infection. Your symptoms speak for a viral infection.
Virus . Fevers with lots of other symptoms like you have are usually caused by a virus. You did not mention nasal congestion . If you have a cough or congestion you could have the flu but the diarrhea would be unusual . If you have not had your flu shot it's not too late!

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