Im sick and i don't know what to do.

it all started last night after a started eating a burger, my stomach hurt, and i just thought that i was full, then about an hour later i was vomiting and i had diharea, i had that combination until about 2am this morning and then all day today i've been feeling weak, i still have diharea, and i'm dehydrated. today i've eaten jello, drink gingerale and sipped water all to try and make it go away. i don't know what this is or what else to do. i can't even stand up for more then 2 minutes before my vision goes black and i need to sit down.