What is the cause of a swollen stomach, vomiting and general body weakness?

Pregnancy?: Swollen stomach can be due to pregnancy which could lead to vomiting (morning sickness). Without adequate hydration & nutrition, you could also feel general body weakness. Of course, anemia from pregnancy could also do this. Best to check w/your doctor. If you're pregnant, there are many other causes for your symptoms which must be evaluated by your doctor so you still have to go see her/him.