Dehydration issues

Just recieved a call today from my doc. My urine came back that I'm still pretty dehydrated. I went to the hospital 4 days before my appt for dehydration. I get sick a lot and have a hard time keeping fluids down. I don't feel bad today or have any of the usual dehydration symptoms but he said if I don't feel well to go back to the hospital. I hate going because they always suck at getting my vein!

Any tips on how to help stay hydrated when you're sick a lot? Sometimes once water hits my stomach it comes back up, but not always! I don't want to have this struggle during my pregnancy. :( But I simply CAN'T stomach 8 glasses of water a day! I get up to 5 most days and sometimes cant get past 2. Suggestions?