8 years ago, I had a severe bout of flu, lasting about 10 days, and ever since have been exhausted. Worked until lockdown, but was going into work later and leaving earlier (my own business). Had tests on NHS - could only have two at a time and results all ok.
I’ve been using a private health company for about 10 years, (every other year) and they have come up with up with the odd result ( from blood and urine samples) that the NHS missed. Cured my cough which I’d had for 5 years, which doctors dismissed, plus a UTI , both of which needed antibiotics.
They have a new test for Essential Energy Profile (£179.00 for 29 blood results and 6 non blood readings) and the Advanced Energy Profile- which I had - (£299.00 for 41 blood results and 9 non blood readings . This includes access to a doctor - to talk to - 24/7.
I should get my results next week, and only hope that I get a clue to my exhaustion.
It’s debilitating, my sympathies to you all.