The phrase "it might have brought me down" typically means that something had the potential or possibility to make the speaker feel sad, discouraged, or emotionally low.

Some examples of how it might be used:

• "Getting rejected from that job really might have brought me down, but I tried to keep my spirits up." Here it indicates the rejection could have made the person feel demoralized but they tried not to let it.

• "If I had failed that test after studying so hard, it might have brought me down for awhile." Here it suggests failing the test could have made the person feel depressed or deflated for some time.

• "With everything going on in my personal life, getting criticized at work have brought me down too far." In this case it implies criticism could have pushed them into worse emotional state considering the other personal issues.

So in summary, "it might have brought me" conveys that something had the potential to negatively impact one's mood or outlook, even if it didn't actually end up doing so. It's about the possibility more than the actual outcome.