I am experiencing nausea (severity: severe) , fatigue, occasional headaches, and mild depression. it's been like this for over a week. suggestions?

See your doctor: There are a number of different causes of severe nausea and you should be seen by a doctor to rule-out any serious conditions. A week of nausea could lead to fatigue, so they may be related. It's hard to know if all your symptoms are connected or not, without getting more history and having a physical exam. Mention all the symptoms when you do see your doctor.

GI symptoms: & fatigue indicate the need for you to see your doctor. You may become dehydrated if you are not already there and that is not good. Peace and good health.