What level of degree are you thinking of? MS/coursework, MS/thesis, or PhD?
I think given your background, GPA, and civil degree, you have very little to zero chance at any of these schools for either the MS/thesis or PhD. For the MS/coursework you would be full pay, and someone might take a chance on you. Civil to BME is a big leap, though, and you haven’t done the undergraduate work that will prepare you for graduate-level classes in BME. Like the others on this thread, I would urge you to think carefully about this plan.