You are conflating the emotion of grief with mental disorders.

It's pretty common nowadays, I find it quite strange.

My grandfather died when I was younger and it sucked. I still miss him.

But I could go to his funeral and hang out with my friends in the bar, go on holiday, study hard at University, etc, employ all of the normal time tested coping mechanisms.

Coronavirus restrictions deliberately took and removed almost everything it means to be human from people.

Sitting inside and only interacting with the world through a screen is obviously hilariously unhealthy.