What Causes Headache Along With Nausea And Vomiting?

I had the flu back in February; got a course of Tamiflu the 2nd day, was sick sort of in waves for a little more than a week. It included headache, severe nausea but not quite vomiting, and then the most severe 24 hrs of diarrhea I ve ever had. Once things settled down it seemed like I just couldn t digest anything, and it has continued that way. Everything just seems to sit in a lump in my stomach. I ve been taking several probiotics for the last 1.5 weeks, and started drinking kombucha. It seems to help a little, but many days I live on smoothies, don t feel like eating, and have that nauseous knot in my stomach. I m seeing a doctor on Friday. Should I be more worried than that and try to get worked in?