If I had malaria about a month ago is it normal to still get nauseous on a daily basis and often even vomit?
It sometimes takes a few days or even a couple of weeks to fully recover from the infection, since it takes quite a toll on the body’s immune system. Also, the medication you take to treat malaria can also have side effects, such as nausea and headaches, which actually seem similar to the symptoms of malaria itself.
However since you have not been feeling well for a month after treatment, you should consider that something else may be going on (gastro-intestinal problem? pregnancy if you are female?) It is best to check with your health care provider.