I Am 43 Years Old, Female. For The Last 4

I am 43 years old, female. For the last 4 weeks or so I have been feeling Nausea everyday and most of the day. Sometimes it comes with a headache too. I am not pregnant. I am under a lot of stress. I am currently going through a divorce, so I am assuming it is stress. But the Nausea is getting to me, and getting worse.