I'm A 54 Yo Female And Have Been Struggling The

I'm a 54 yo female and have been struggling the last few days with headache &, being nauseated. It seemed better yesterday and then I ate dinner and I started feeling sick to my stomach again. This morning I woke up and could not stand very long before feeling sick. The headache is better this evening but so not felling well. I started the BRAT diet today trying to alleviate my symptoms. I may have had a fever but not sure.