"I was too hungry to eat anything." the problem was after the checkup

Annual medical checked ended without much problem except for 30 minutes train delay.
The problem was after that.
I hadn't eaten anything until the checkup ended, and when I was about to have lunch, I felt sick.
"I was too hungry to eat anything."
My eyelids and upper teeth were sore.
I managed to eat a banana, a pack of orange juice and a piece of bread.
In the afternoon, I slowed down the pace of my work.
With help from co-workers, all work for day ended without problem.
The reason of the pain at the lunchtime was from stresses of many different elements.
These days I have been working at a pace a little bit faster pace than usual, and I feel tiredness about it.
In addition, in the beginning of this week, public transportation I take was irregular, and I had to wait for a long in crowds.
Major events in this week, the annual medical checkup and monthly meeting, may have worked badly as stress to me.
Now, one of the major events ended, so I hope that my condition will recover soon.