I can relate to what you are feeling. I have three children and was so sick with ALL three of them that I was hospitalized with each one. I couldn't keep anything down, felt so so awful all of the time, the blood vessels in my eyes were broken and I was always quite dehydrated. The Dr. put me on some kind of drug (can't remember what it was) while I was in the hosp and then sent me home with it also. With the first two the sickness stayed most of the way through my pregnancy although it did lessen. The best thing to do is try to eat small small amounts of food (anything you can) and drink separately. Do NOT eat and drink at the same time. Whatever you can find to drink, if you try to keep your drink room temp. sometimes that helps.
With my third I started to become ill right away, my new Dr. at the time did hospitalize me also, but when I went home, he started me on long acting gravol (available over the counter) which I took twice a day. (i think it lasts 12 hrs), so I took one early morning and one before dinner (they were capsules, not tablets, hence the long acting). This worked much better than the medication I had been on with the other two. It did make me tired, but after a few weeks that didn't seem to bother me any more. I was still sick to my stomach but not nearly as much and was able to function, most important of all, I was able to eat things that were healthy for me, keep myself hydrated and nourish myself and my baby properly.
I am not advocating that you take any medication etc. without your Dr.'s consent or anything, you have to make your own choices. Some physicians just say that it is part of being pregnant, but if it is keeping you from eating or drinking, eventually it is not going to be good for you or your baby.
I was also in the same predicament as you as I found out I was pregnant while I was in Florida and was sick as a dog. It pretty much ruined the rest of our trip, so try to find something that is going to work for you. (what works for one, doesn't always work for another)
I sincerely hope that you have a good trip and that everything works out for you. Oh, and CONGRATS on the pregnancy! It is all worth it in the end!
P.S....I just read some of the other posts that were posted while I was writing this. I should let you know that my last pregnancy was 14 years ago, so there probably are other medications on the market that would do a good job also, as mentioned by another poster.
Just remember when weighing the good or bad of taking a medication, that you need to eat and drink to keep yourself and your baby healthy. Also, if you are taking a multivitamin sometimes that can upset your stomach also, so you may have to stay away from that also, then your diet becomes even more important.