They now run it financial year..due to being able to make claims through tax. Safety Next is calendar year I think?
I am pretty certain you can put your medical expenses against his?

The medical expenses must be for:

you
your spouse, regardless of their income (see the definition of spouse in Special circumstances and glossary)
your children who were under 21 years old (including your adopted children, stepchildren, ex-nuptial children or children of your spouse) regardless of their income
any other child under 21 years old who was not a student, whom you maintained, and whose adjusted taxable income (ATI) for the period you maintained them was less than
the total of $282 + $28.92 for each week you maintained them for the first child under 21 years old, or
the total of $282 + $21.70 for each week you maintained them for any other child under 21 years old who is not a student.

this is direct from the ATO website.