A few days ago I suddenly crashed really hard, the type where you feel close to death, semi conscious etc. I managed to drag myself to bed and fell asleep for 15 hours. Since then I've had a mild temperature, lowered appetite, and increased fatigue and tiredness which on top of my usual level of health has made me bed bound. But none of the other usual flu or cold symptoms that I would expect from infections I've had in the past. It feels like a half flu that wants to come on properly but can't. Im certain it's not a usual crash. Anyone experienced this? know what it could be?