Hello. I am a 26-year-old female. A couple mornings this week I have had a sudden onset of nausea. Each time the feeling only lasted a few minutes before subsiding. The first day it happened, I had taken a multivitamin after I ate breakfast, so I thought I had just waited too long and it caused the problem. The second time, the vitamin was taken with my breakfast (another day I took the multivitamin with no problems). Both times it has happened around 10:30AM (2-3 hours after I have eaten). The only other change in my health recently has been starting on an interval training program (walking/jogging).
I don't know if it would be connected, but I will mention that I had been in parts of Swaziland and South Africa during 2009 and 2010.