The hardest thing is to figure out why you don't have energy in my case I have to guess allergies (always sinus problems).
As a child always had trouble with my ears, in my twenties sore throats in the morning and often rinsing my mouth with salt water because I thought my tooth was infected.
Not till in my 60ties I found liverflushing, since I needed gallbladder surgery,
I found out all my year round allergies were gone. Actually never knew they were so many symptoms for allergies, always thought people with allergies had to sneeze a lot :) I had seen that from my father.