Losing weight during pregnancy

Im pregnant 11 weeks plus and I lost so much of weight during these time. I'm considered under weight now. Im really worried. I can hardly hold any food down because of my nausea. My nausea is quite bad. I was admitted in hospital for 4 days and put on drips. After that I felt a little better but still vomitting here and there. I'm very sensitive to any strong food smell and I Don't usually have appetite to eat. When will this ever get better? #advicepls #firstbaby #1stimemom #pregnancy #pleasehelp