( i know its not that good )
Hey, this is not a good disclaimer to use n your work! The thing is, it is all good if it is genuine. It has the essence of you. Criteria for judging what is good vary from one reader to the next.
For one thing, your intro is excellent. Nothing catches the attention quite like mentioning suicidal thoughts. That first paragraph is like a big wind up with no pitch, though. Proclam your thesis statement boldly at the end of that first paragraph. Add a third sentence... one that catches the theme of the whole essay (thesis sentence).
After writing that thesis at the end of the first para, the moral of the story, elaborate on it more in the last para.
You might also want to mention getting permission from your brother to write about his process, and mention that his suffering became more meaningful as you tapped into his experience to write this essay, which is so important for your own process.
Does this kind of intervention have anything to do with your career plan? That would be cool...