Hi Laxxa,
I am based in the UK and suffered a TIA stroke two years or so ago. It occurred whilst working in the Office on the telephone, tingling down the right hand side of the face and unable to talk! I regained my speech fairly well over time thanks to a new clot busting treatment.
The UK CAA pulled my class 2 medical and the Driving agency did the same. I had passed my JAR ( Euro land Pilots Licence ) medical six weeks or so beforehand, so proving it was just a snapshot on the day.
I was 60 yrs old and just a hobby Pilot / aircraft owner, not like you looking for a career in Aviation. I eventually obtained a NPPL ( National Licence peculiar to the UK ) and my doctor signed a medical declaration which once more allows me to fly again and take passengers but only basically in the UK ( no more foreign flying holidays! )
The Medical Declaration is based on the UK medical car driving standard! The combination of the NPPL and Medical declaration have kept many Pilots flying for leisure purposes in the UK who would otherwise have been grounded for ever ( statistics have shown over time that these pilots pose no greater a risk than others flying on a JAR Euroland medical )
Moving on to your'e situation the UK CAA have very strict medical criteria for many illnesses including cardio vascular type problems and I suspect the Aussie equivalent may be the same. In the UK anything classed as a stroke is automatic debarring for a class 1 medical, end of story.
However in your case you mention a hole in the heart which has been cured but you do not say if this was the cause of your'e stroke? blood clotting perhaps? I suspect you may well have to go down the route of specialist's to prove that you no longer pose a risk for a class 1 medical and it may well be a long and frustrating path, but in my view possibly achievable if you can get the correct people to say the right things!
Another thing possibly in your'e favour is multi crew resourcing which could possibly give you a role in the Commercial field but I have no experience of this aspect but hopefully others will be along with the knowledge.
Best of luck and keep us Posted as to how you get on as Strokes and heart problems, contrary to Public belief have no respect for age and you are a very young man and without doubt others will be faced with similar difficulties in the future.