What causes chronic diarrhea, nausea, vomiting, dizziness, fatigue, insomnia, fainting, Full bowel movement in sleep, headaches, eye pain?

Viral syndrome. Other than the "full bowel movement in sleep" what you are describing is consistent with viral syndrome which requires rest and hydration and should not last more than 5 days. Avoid dehydration as you are losing water and it will make symptoms worse. make sure you eat and keep activity and environmental exposure to a minimum until you recover. Let your doctor know what is going on.