I'm just typing this from mobile and will add more to it later, but if you suffer from anxiety and depression, academia may not be the best choice for you. And I say this not to be discouraging, but because it can be tough. I'm currently doing my PhD in medical history and definitely wished I listened to everyone telling me that PhD's are incredibly isolating and are emotionally taxing.

I'm in the UK so I can't speak too much about American PhD programmes, but I needed relatively high undergrad grades and a Master's degree with similar grades. If you're able, finding a history-related Master's degree would probably be your first step in pursuing a history PhD. There's always hope of funding, but arts degrees typically have less funding than STEM subjects.

EDIT: spelling

This resulted in me graduating with a 2.7 GPA.

You can't go to grad school with that. I'm sorry.

Getting into grad school is a matter of winning over your potential advisor, the department/program, and then getting a rubber-stamp approval from the university. University policy--regardless of the department or advisor--just about universally includes a minimum 3.0 undergraduate GPA.

There's also the thing where there are no jobs in academia. If you want to teach, go get an MA in secondary ed with a specialty in history. If you want to learn about history, well, the New York Public Library might be the best in the world. People at AskHistorians would be thrilled to help you find or make a bibliography of books to become a grad school-level expert on a topic. Meanwhile, you could be working a job that would actually pay enough money to live on (everyone I know in a PhD program either has help from their parents or is taking out loans).

But whether you should go isn't the question for you right now.