RR, I moved your question about brain fog to this existing discussion so you can connect with others experiencing this symptom easily. See previous posts here:
- Does COVID brain fog go away on its own?: https://connect.mayoclinic.org/discussion/brain-fog-go-away-on-its-own/

You might also be interested in this related discussion:
- Has anyone had any recovery from months of long Covid brain fog?: https://connect.mayoclinic.org/discussion/has-anyone-had-any-recovery-from-months-of-long-covid-brain-fog/

And here's a blog post from Dr. Van on the topic.
- Post COVID Brain Fog: The Consistent Mystery https://connect.mayoclinic.org/blog/post-covid-recovery/newsfeed-post/post-covid-brain-fog-the-consistent-mystery/

Brain fog is real. Have noticed any triggers like stress, lack of sleep, exertion that bring it on or make thinking straight harder?