I have been I ll for a year. No diagnosis! Extreme weakness, unsteady standing, headaches, diararia, lack of concentration, always tired, cannot stand without help, vomiting, dizziness. I am 73 years old, female, complete exams, cardioigest, neurologist, many blood tests, all are negative,. This is progressively getting worse. I have always been in good health, worked in landscaping until I became too weak.