Unfortuanately, sick leave--or indeed any leave policies (including vacation days, PTO, comp days, personal days, etc.)--is entirely at company discretion. There is no legal obligation to provide paid sick leave. Certainly, paid sick days are customary and the norm, but they are not actually required.
You acrue (according to what you wrote) around 1 day every month of vacation time. Possibly you might check whether that time may also be used as sick days, should you need them.