Today is another good day, as all the things on my schedule goesare going the right way.

Of course, the instant gratification monkey still annoyed me so much, even though I had prepared some powerful tools to dispel ithim.

I changed "it" to "him" because you use male pronouns in your last sentence. I think either way can work in this context, but it should be consistent.

I guess, like asomeone with schizophrenia person, I have to live in harmony with him instead of behavtreating to him aslike a rival.

Or: "I guess, like someone with schizophrenia, I have to live in harmony with him instead of thinking of him as a rival."

"someone with schizophrenia" can also be "schizophrenic" : "I guess, like a schizophrenic, I have to live in harmony with him instead of treating him like a rival."