No this is known. Ive posted about this before. But covid can cross the blood brain barrier. Causes neuroinflammation. Neuroinflammation is related to a whole host of mental health disorders including anxiety, OCD and depression. Covid can thus trigger or worsen these disorders.

SSRI has a significant anti-neuroinflammatory effect. Could be the main reason for their efficacy. People who take SSRIs have a lower risk of being severly ill from covid.

I dont have a lot of time thus the very short explanations and answers. I can back every single statement up with peer reviewed papers if anyone doubts me however. May add these as references after work.