Hello! These type of nausea, vomiting and loss of appetite are very common during first three months of pregnancy.There is a medicine called Doxinate that is usually taken to control nausea and vomiting which you can take under the supervision of a gynaecologist. Please be in regular touch with your gynaecologist so that she can guide you properly. Try to take small meals at small intervals and light diet so that you can digest it easily.Try to do small walks so that you can digest the food. Please be in regular touch with your doctor.