Good days and Bad days

Today is an inbetween day...I'm tired, but didn't get much sleep so that makes sense.  Yesterday was a very good day with lots of energy. The day before was horrible, every cell in my body hurt by afternoon.  Early to bed with 2 naprosyn and slept 8 hours with few 'wake-ups' and I felt good the next day.  The up and downs are frustrating, maddening, disheartening.