No doubt trying a few searches will give you days of reading on this subject.
Did you identify yourself to CASA when you admitted to migraines?
If so, and they (migraines) are fixed perfectly and permenately, expect several years of fighting CASA...
Unless you have cattle experience it is unlikely you will get a job mustering now.
Getting any flying experience after your commercial Licence will be difficult.
The industry world wide is in one of its lowest ebs ever. In the US pilots are being laid off to be replaced by pilots willing to work for less.
In Australia there are unemployed pilots with impressive qualifications and experience.
Might as well go in with your eyes open.