Feeling tired all the time

Hi everyone, 7 months ago I had a flu, I've got better after 4,5 days, but I have the fatigue problem now for 6 months since that time. I was full of energy and I barely felt tired. I did 4 cbc blood test, thyroid test, hepatitis b and c, hiv, ESR, CPR

All was normal and negative.

I don't know what to do, I wake up tired every morning.

Any advice?

Thanks a lot.