Your 3.3 GPA isn’t that bad. (Avg admitted GPA ~3.55-3.6, so 3.3 is low but not out of the ballpark) Probably not as competitive as you would like it to be, but it wouldn’t necessarily keep you out of medical school. If you do have aspirations of going to a top 50 school, your choice to pursue some graduate classes first is probably a good one to help boost your chances.
When considering grades, a C+ isn’t horrible. It is generally said that a “C” or lower in any premed classes (bio, chem, organic, and physics) needs explanation, but other classes not as much. You don’t want to come off as whiny (but trust me, I’ve gotten screwed over too, so it’s not like I don’t know understand your frustration over it) and you don’t want to draw too much attention to a negative. You should focus on your strengths and what you have to offer. I would doubt that one grade in a non-premed course (especially a C+) will be the difference in whether or not you are invited for an interview. Then, if they ask you about it, you can explain the situation.
Also, “complicated” is bad for these essays. Not that you want to be turning out top quality “See spot run.” stuff, but if it is a complicated situation trying to explain it in a limited essay space you run the risk of submitted a confusing essay which could count against you.
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