But it’s so much easier to blame all our problems on Covid
I'm not denying that it could be Covid-related.
The other Jelly asked "Is there any scientific research on that?" and the answer is yes, it has been researched long before covid appeared, because it's something that happens to everyone. Sometimes called a TOT event (Tip Of the Tongue).
https://thereader.mitpress.mit.edu/tip-of-the-tongue-phenomenon/ It occurs maybe 1-3 times per week in 20-somethings, twice that in those over 80. It usually affects proper nouns (words we capitalize in English), so it takes a minute to remember the name of your neighbor, Chaim Yankel, or the tech company, Microsoft. The 20-somethings just get annoyed and brush it off. The 50-somethings pay more attention to it, because they worry that it's the first sign of dementia. It's not. Dementia is when you see your neighbor in shul and greet him with a hearty, "Good Shabbos, Microsoft!" It gets worse when we're influenced by stress, alcohol, insufficient sleep.
Could it be related to Covid? It IS one of the many symptoms that have been included in "brain fog", but from my reading people usually report more than one of those. Here's one rundown of them:
https://www.cuimc.columbia.edu/news/even-mild-cases-can-cause-covid-19-fogIn our clinics and in case reports worldwide, patients report fatigue, inattention, poor concentration, difficulty working long hours, difficulty getting out of bed, a “brain fog.” This is similar to what small studies reported in survivors from the first SARS virus. Some also have more specific thinking and behavior problems—they forget the names of people they know well, they can’t follow along during business conversations, prioritizing and planning is suddenly difficult, they are inexplicably anxious and sleep poorly.
Similar to the first SARS virus, patients are experiencing unusual sensory symptoms. Everyone has heard about the loss of smell and taste in COVID-19 and other viruses; we’re also seeing changes in appetite, lightheadedness, body discomfort, and new or worsened headaches that don’t always respond to traditional pain relievers.
These are young and middle-aged people who were previously thriving. Now they are having profound changes in the way they think and feel. They’re worried about their careers, if this persists.
The good news is that most of the patients we’re seeing are getting better.
So this makes me think that if having TOTs is the only symptom someone has, it's more likely that it happens normally, and that you may be just paying more attention to it now and associating it with covid.
But even if it is Covid-related, the "treatment" would be the same: Avoid alcohol, find ways to reduce your stress, get enough sleep (for most people 7-8 hours/night), increase your aerobic exercise (walking, jogging, basketball), and eat healthy foods (For most Americans, that means less red meat, more vegetables and fruit, less oil and sugar. I know, it sounds a lot like pareve cholent.)
https://www.health.harvard.edu/blog/what-is-covid-19-brain-fog-and-how-can-you-clear-it-2021030822076