What Causes Sharp Pain In The Navel Area?

Hi Doc, I encountered a very sharp pain in my navel for days which increased in pain twice, I thought it was food poisoning but when I got to the hospital they conducted series of test and came out without any substantial result. I ve been given drugs for worm, and infection but no result yet. I haven t seen my monthly circle/period, I have pains in my breast too and I feel like vomiting. What do you think could these symptoms be of? Thanks. Miss. Brown.