Welcome to the OCF forum from a fellow Aussie Rachel. There a quite a few of us here.
Dave1989 also from Brisbane immediately comes to mind even though his situation is closer to mine except for age as he was 21 at diagnosis.
I have no experience with fibrosarcoma but see that you are already getting some responses from the wonderful people here.
It is great to see that you are being seen by a multi-disciplinary team at the Royal Brisbane.
When this week are you having the tests and scans? When you do ask them how soon you can get your results as the waiting time can be very stressful. I will have a meeting (next Monday) with my surgeon after a recent biopsy but rang and got the basic information (no cancer smile...yeah) after a few working days.
I will be watching for your posts and am hoping for good results for you.

History Leukoplakia bx 8/2006 SCC floor mouth T3N0M0- Verrucous Carcinoma.
14 hour 0p SCC-Right ND/excision/marginal mandibulectomy 9/2006, 4 teeth removed, flap from wrist, trach-ng 6 days- no chemo/rad.
6 ops and debulking (flap/tongue join) + bx's 2006-2012.
bx Jan 2012 Hyperkeratosis-Epithelial Dysplasia
24cm GIST tumour removed 8/2013. Indefinite Oral Chemo.

1/31/16 passed away peacefully surrounded by family