I had what I thought was the flu last week, fever, chills, stomach pain, vomiting, diaharra, aches all over and very tired. I spent 3 days in bed. Then it passed only to return a few days later starting with a bad headache then the fever, chills and stomach pain. It now comes on every evening for the past few days the same way, headache, fever, pain and chills. Is it the flu or should I see my doctor?