You might have the flu! I'm guessing you haven't had a chance to get a flu shot yet?
Head colds don't come with high fevers and that kind of extreme fatigue. Sounds like flu.
Glad it's not covid, though and hope you both feel better soon! I've had 2 awful colds this year (I live in OC) which seems so strange given how many covid precautions I've been taking. Although the second cold came after 2 days at our local Great Wolf Lodge at the end of July. Unfortunately, we've learned through the years that people show up sick to the local attractions and just power through. You'd think that this pandemic would have changed that, but nope.