Please please help!

I'm 18 weeks and was naseous for the first time last night right before bed. I knew something wasn't right. A few hours later I'm up all night vomiting and have diarrhea (sorry tmi.) I still feel the same with the same symptoms and can barely keep water down. Hubby is going to run to the store for Gatorade and 7up. Is there any meds I can take for the flu? I feel terrible not even being able to eat for my baby's sake. Will he be ok if I'm not able to eat today? Thanks in advance.