hyperemesis crisis

I have been vomiting non stop all throughout my pregnancy when I do not take ondansetron or use medical cannabis really dont want to take anything at all ive been hospitalized several times because of it I cant even hold down liquids ive been seeing a midwife and a mm doctor both in there respective fields for two decades anybody have any advice on how to get rid of vomiting caused by hyperemesis gravidarum also worried about those hospital tests I mostly use cannabis I know ondansetron causes birth defects I had the same problem in my previous pregnancys one of my daughters has seizures as a result of me taking this any advice greatly appreciated.