Yeah I got what you're describing 2 months ago after sharing a vape pen with someone that is double-jabbed. Used alcohol swabs between uses but still it transferred from saliva. I never had anything like whatever I experienced for the next 3 days. The illness started in the middle of the night, I woke up shivering like I was naked in -20 weather. My entire body was sore and stiff (specifically bones), felt like my brain was going to burst through my skull from internal pressure. If COVID exists then that must've been it; if I caught something like that as a 50+ year old it would've taken me out.
I just water fasted during the whole 3 day ordeal and continued Z protocol and was fine after. Also I took 3 Aspirin (Willow Bark) on beginning of day 3 and it removed all of my body pain after 30 minutes and notably felt much better; should've used it much sooner but now I know for future.