extreme vomiting

Hi mummies! I'm 8 weeks pregnant right now ,and having severe vomiting ,to the point that i cant eat or drink anything without vomiting it out . I tried to keep it in but always feel very nauseous after eating or drinking and will end up vomiting . Are there any home remedies for this ? Any drinks or food to take ? Its been going on for 3 weeks , was admitted to the hospital 2 weeks ago but after discharge ,the vomiting came back . The medicines didn't work too .