It is very important to know the average pre-req, overall gpa and gre scores of the schools you are applying to. This helps you distinguish between the schools that are way above your reach (for instance, for me its Yale) and for schools that you have a shot at. There are certain schools however that do look at your last 60 sem units/90 quarter units instead of overall gpa.
Essays and quality recommendations are equally important!
But the most important thing is to be positive. Your gpa is just a number that unfortunately does count towards your application. But there is no value to the passion and drive that you have towards the health field. So don't let your statistics worry you.
If I were you, I would focus on:
1) Studying long and hard for the GRE. Make that your focus!
2) Obviously, make sure to get stellar recommendations
3) ESSAY! Make it you! Make it outstanding! Revise!
4) If you can- intern a nurse practitioner and gain more knowledge towards the area of specialty that you're applying for!
Good luck! If you would like to know my stats- PM me!