You can do Physics and still get into Chemistry though. The head of Chemistry is actually a Physicist with a Bachelor of Arts majoring in mathematics.
You shouldn't worry about the job side of it though, mate. You got a 99.95, back yourself 
99.95 means nothing. It really doesn't mean anything aside from the fact that I spent my time in years 9-10 learning Methods and spesh and that my school had an awesome year 11 science program.
It's not that. I do have my crazy study plan up my sleeve if I really want to do a triple major and I could, if I had to, take an extra semester to do it. I need to see if I can do enough level 1 science subjects to meet the 62.5 point requirement but not have them credited. If I could manage that, I reasoned that I can allow myself to do an extra six subjects, which is a LOT of health science subjects. IF.
If it helps, books huge and there are good odds that you'll find an aspect you'll like after some broad study. For example, I'm getting really into regenerative medicine and I'm going to apply for an internship at the ARMI in the winter!
If you're really into physics, biomedical engineering is a pretty great cross-disciplinary area 
What's it actually about?
I envy the fact that you know what you want to do...
I know what I WANT to do. I don't know how to intersect what I want to do with what will give me a decent career that won't let me starve.