I've been undergoing testing for years for
similar symptoms, along with a ton more.
The first things all my doctors suggested
was depression. This is not the case for
me, but believe me, they will suggest it,
and it's something to look into.
I was finally diagnosed with fibromyalgia
and chronic fatigue syndrome, but my
doctors are still testing so I'm not sure
how confident they are in their
diagnosis.
Just a few things that were brought up as
possible causes for fatigue, naseau, foggy
thinking, achiness, etc, etc, were a
thyroid disorder, Lyme disease, B12
deficiency, anemia...
There are so many things that could be the
cause of what you're feeling. I would
defiitely agree with the suggestion to go
to a doctor. It might help to keep a
journal of how you feel every day for a
while, and write down all your symptoms,
etc. I didn't do this at first and I
would constantly forget to tell my doctor
about things.
Good luck!