For Past Four Days I've Had Fatigue, Waking Several Times

For past four days I've had fatigue, waking several times nite from either.having chills or sweats, lack of appetite, feeling of slight cramping/slight nausea but hanen't had menstrual cycle since May' and a little tightness on right chest area, but this could be from staring with constipation I've also been having. During the day, I feel hot, mostly in my head but temp in room is normal.