Question....

Hi all - I am relatively new to this board, have posted occassionally, but actually spend more time just reading the posts and responses. So very helpful. I am a little over 6 weeks out from surgery and down 39 pounds so far. My question is, the last few weeks, every time I eat I get an intense headache for about an hour or so. It eventually passes until the next time I eat. Fluids are going down fine, but I am having difficulty eating because once my head starts hurting, I get sick to my stomach and just want to quit. Has anyone else experienced this or any ideas what it might be? I go back to the doctor next week for followup. Thanks! Sheri