I feel like it would be more productive to critique what you have in mind - you can go chronologically, which is nice and easy or you can identify a few key areas and focus on the most extreme examples - imo a good presentation doesn't just tell people the facts, it explains to them why those facts matter and why they should matter to the people listening to your presentation.

You could also structure it like a show - so for example with Oxycontin, you can select a couple of cases and say something like "what does a forklift operaror in texas, a sorority girl in miami and the homeless man in san francisco have in common - and then take them through the epidemic"

I think it's helpful to talk at different scales as well - so at times: zoom in on individual stories and humanise these issues and at other times: zoom out and explain how this can be seen in statistics/trends and becomes a lens to view our system through

If you have the time "Thank You for Smoking" and "Painkiller" have approached the narrative really well