I too suffered from very similar symptoms...especially that darn nausea, day and night!
First I want to say that I had several colon cleansings...juice fasted and even water fasted for a couple of days hoping I could flush out the sickness myself.
However, when those methods didn't work and after months of feeling good one day and horrible the next...I had to go see a doctor.
He took a stool & blood sample... and it turned out to be something that I never heard of...H. PYLORI! I still find very little info on the net about it...