Hi @KatieA. Sorry that you're on this path, but hopefully you'll find a lot of support out there.
You'll find a lot of information on website
www.reclaimyourcurves.org.au and you can also connect via the phone or online. After you've finished radiation, there will be options for you to achieve symmetry again. It's nothing to be embarrassed about or considered vanity - it can help in both the physical and emotional healing process after the shock of diagnosis and treatment.
As others have mentioned, depending on your suitability, a reduction on healthy breast or small implant/fat filling on affected breast may be options for you. When the time is right for you, seeking a couple of plastic surgeon opinions(who specialise in breast reconstruction) would be the way to go. Depending on what area you're in would reflect what services are available to you.
All the very best as you progress through treatment xx
