Would the meaning be changed if I skip "about it" from this sentence?
Native speaker’s answer
Rebecca
No, the meaning would not change if you omit "about it" in this sentence. The phrase "about it" refers to his OCD, and is just used to emphasize the OCD. If you omitted "about it" in this sentence, it would make lessen the emphasis on the OCD, however, it would not change the meaning of the sentence.