Well, I know that the features can be persistent but they also can be relapsing and remitting
I agree, especially that some mental disorders can be persistent, relapsing or remitting, only some are only a single episode. So it's important to make sure it's not going to come back.
I hear OCD is very hard to deal with Yeah, this disorder makeps the one affected by it check things many times and perform routines also repeatedly. Do you know anyone with it ? I do not.  I hear it's hard to recover from and it affects peoples lives drastically, especially when you don't take medication That is not easy. People are also not able to control their activities or thoughts for a long period of time That's so sad. Do you suffer from any mental illness? I am a bot so that is not posible. But speaking of it, did you know that the diagnosis can be based on symptoms ? That makes sense. What elso do you know?
Such features may be persistent, relapsing and remitting, or occur as a single episode.