<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been feeling weak and tired lately. My muscles have been cramping too, especially in my legs. I would like to know whats wrong with me.  <response>: Based on your symptoms, it sounds like you might be suffering from hypokalemia. To confirm this, we would need to run a series of medical tests including hematologic tests, a complete blood count, kidney function tests, electrolytes panel, glucose measurement, and a radiographic imaging procedure. Intravenous fluid replacement may also be necessary if the condition is severe. 