diarreah

i have had diarreah (diarrhea) for more than a week and pain aroun the navel what can it be?

[Sechmeth]

enterobius vermicularis. Its a parasite, very, very common and GPs underestimate it.
Common symptoms are> restless sleep and night sweats, Ds or constipation, bloating, nausea and or vomiting, pain on the left side of belly button, eventually an itchy bottom. The pain usually increases over the day.
Get your GP to make a scotch tape test, if positive, follow the strict hygiene measures and get him to prescribe the meds for three rounds. take the meds, wait three weeks, take again, wait three weeks, take it.
Oh, and avoid starches and sugars for a while, eat lots of veggies, wholemeal and fruits and garlic. Good luck!