I need your medical advise pleeeese? I suffer from an unknown medical condition and need your assistance.  It includes a very serious case of fatigue and sleepiness in which case all I seem to do is sleep and sleep. I could sleep for days at a time without knowing. I lose my appetite causing me to go into dehydration.  While in this state and during the rare times that I am awake I partially loose my hearing, I have vision impairment, partial loss of memory, diarrhea, vomiting, loss of sense such as smell, taste, and texture, fevers, headaches, and serious case of fear of being left alone.  This usually can last any where from 1 to 7 days and than I oddly wake up from it like nothing had happened.  When I am fine I dont remember what happened while I was sick. I have been to all kinds of doctors in and out of the states and have gone through vigorous test's and analysis and no one seems to find anything wrong with me. Have you seen or heard anything like this? And if so what is it and how can I get better?

Summarized question: What can cause fatigue, sleepiness, loss of appetite, hearing loss, vision impairment, partial loss of memory, diarrhea, vomiting, loss of smell, taste, and texture, fever, headaches, and a serious fear of being alone?