I was expecting you to step back / feel worse after you slept flat for 7 days. Was surprised when you said everything was as before except for the headache.
The fatigue should resolve over a few weeks.
Your backache is probably down to a poor quality mattress together with the traction the incline places upon the spine.
This can also be the cause of backache as the posture becomes more upright over time, but should ease.
To test to see if it is the mattress, wrap a quilt / duvet or a thick soft blanket around the mattress and under the bottom sheet.
Thanks for the update.
Please avoid sitting at computer for long periods, this is not good practice.
Limit yourself to an hour max and then move around for half an hour if you must return to the computer.
Make sure your seat is higher than your knees so the incline can still work during the day.
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