I have had it and to a small degree still do. I fight it off with rest, exercise, and diet. I did have to have some surgery before a hunting trip last year, 3 days in bed being pumped full of liquids. I don't know if it was what they removed, the rest or the liquids and antibiotics but I left felling better than I had in 20 years.
Be patient, "this too will pass". I have the same problem with firewood as you and others have expressed. Isn't that funny.