hiya
quite a few people find this with cyclizine, its actually an old-school anti-histamine and they did make people sleepy, hence the warnings about machinery.
cyclizine is usually the first - line treatment, often paired with vitamin B6. If its not working, or if its got side effects that are too heavy, there are definitely others.
Diclectin (made of antihistamine Doxylamine and B6 in slow release form)
Pyridoxone (vitamin B6)
Promethazine (an antihistamine, brand name Avomine)
Cyclizine (an antihistamine, brand name Valoid)
Prochlorperazine (brand name Stemetil)
Metoclopramide (brand name Maxolon)
Ondansetron (brand name Zofran)
Domperidone (brand name Motilium)
Prednisolone (this is a steroid)
Ondansetron and Prednisolone are pretty heavy (though safe!) and rarely prescribed first off. Usually the doctor sort of starts on cyclizine and then substitutes or adds others.
It's well worth going back to the doctor if you get heavy side effects and ask for something else. Some people find Stemetil very good.
The Governmental body NICE has published the guidelines for Best Practice that all doctors are supposed to follow, though sadly some dont. If you read up here it'll help you know what to discuss or ask for from the doctor. Reducing vomitting and nausea -is- one of the Best Practise goals, so you really are entitled to ask for more or different help!
good luck =)