What Causes Constant Hunger And Fatigue?

I m constantly hungry, weak, tired and unmotivated. It s been going on for a few months. It feels if I m having a panic attack or im about to pass out and te only cure is for me to drink water, sit down and eat food. I m very active but this is starting to harm me pysically. I find things that used to be easy, very tiring. Like washing my car or even cleaning the house. Please help