Your overall GPA matters very much. When an adcom looks at your app and they see lower than a 3.0, into the trash it goes.
Realistically, for medical school, you're going to need a sGPA of at least 3.3 and a cGPA of 3.2. There are exceptions, but they are rare people with many years of exceptional ECs for the most part. These people are not you. Basically all reputable postbacs won't even accept a person with under a 3.0, so that option is pretty much out the window. I wouldn't even worry about calculus, because basically every med school that requires calc is going to be out of your range anyway. Take algebra based physics, then orgo 1 and 2 after you finish your degree. If you get decent grades in these courses, then come back and see us. I wouldn't plan much farther than that for the moment, but as a long term plan you might be looking at retaking a LOT of the courses you screwed up in undergrad, as AACOMAS allows you to replace old grades with new ones, effectively erasing them from your GPA. This could give you a good shot at DO school. Your chances at an MD on US soil are pretty much shot unless you spend the next 5 years doing some real Mother Theresa **** before you apply. And I mean some real serious, working with a guy named Mbuto and piles of dying African babies sort of work.
In short, your chances are not good. Not impossible, but not good at all.