What Could Cause Sudden Fatigue, Poor Sleep, Sweating, Nausea, Loss Of Appetite, And Shortness Of Breath?

Hello. About 3 days ago I became very tired yet can't sleep well. 3-4 hours at night and then naps off and on all day. I'm sweating with no fever, loss of appetite and somewhat nauseous, I get winded just walking out to the yard. Previously had none of these symptoms.