Narrative:

Had massive stomach cramps after level off at cruise. Switched positions with [relief pilot]. Got sick twice in lavatory; shaking violently. Decided to [aircraft returned to departure airport] to ZZZZ. Went to hospital. Blood test confirmed I had pancreatic episode. Feel totally better today. Slept all day.

Google
 

Original NASA ASRS Text

Title: B747-8F flight crew reported airborne medical return to departure airport due to Captain experiencing pancreatic episode.

Narrative: Had massive stomach cramps after level off at cruise. Switched positions with [Relief Pilot]. Got sick twice in lavatory; shaking violently. Decided to [aircraft returned to departure airport] to ZZZZ. Went to hospital. Blood test confirmed I had pancreatic episode. Feel totally better today. Slept all day.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.