Can I still aim for medical school?

Hi, I'm currently a senior in college in Florida and I was in the Health Sciences Pre-med track for most of college. I recently had to change to the general track because I've failed my science classes. I took organic chemistry 4 times and failed and took physics twice. I'm currently in physics and I've been doing pretty well so far and I believe I can pass this time. But my school says I can no longer take orgo1 since I already took it 4x. I pass all of my other courses but failing the science classes really put a hit on my GPA. I was planning on getting my Master's in Public Health before trying to apply to med school. I really need some advice because being an OB/GYN is all I've ever wanted to do and still the only thing i want to do. I was also recently told that an MPH doesn't actually help so if someone could explain that, that would be great. Thank you!