

That’s not how your immune system works. Your immune reserves are not “spent” nor do they need to replace ones “lost”. It’s not like a military battle. Most pathogens are either destroyed or they avoid destruction through some mechanism - they’re not often fighting back against the WBCs.
Your immune system produces chemicals that make you feel like shit / tired, because it’s evolutionarily advantageous to feel like shit. This keeps you resting and away from others. This is also how medicines like NSAIDS or steroids can make you feel better, by inhibiting the processes instigated by WBCs. It’s not the disease that makes you feel bad, it’s your immune system (unless you’re deathly ill, we’re talking common cold/flu/COVID type stuff here).
It would be impossible for me to go in depth in immunology but your explanation is not at all in line with the evidence we have currently.
Plok - Beach