Should I be worried?

I'm 26 weeks pregnant, as of last night I've had some discomfort in my upper abdomen (it feels like my organs have all been pushed under my ribcage which seems possibly normal for pregnancy), I've had some diarrhea, headaches, nausea, and so far haven't been able to keep anything down without throwing up. Even dry food like Cheerios and even water will make me nauseous. I haven't had morning sickness since early in my pregnancy and even then it wasn't this bad. I've also had some dizziness but I think it's from the headache and vomiting.