My employer gives unlimited sick time but if you use too much you might have to talk to hr about taking a leave of absence if its something long term. If I am not feeling good I “call in” (i.e. send an email :•| ). We also have PTO but being salaried I get paid the same for sick days anyways. If i need a mental health day I just call in and use PTO only for vacation days like they should be used