Working in the third trimester

Celeste
I'm a waitress at a small restaurant. We aren't very busy this time of the year but it's starting to pick back up. I'm working part time but putting in 2 10hr shifts back to back with very limited breaks. I'm in so much pain by the end of the night the drive home is unbearable. On top of that I spent half of yesterday in the ER because I was dehydrated and couldn't keep down any fluids. The doctor said I have the stomach flu and should be better in a day or two. Any other mamas to be have any advice?