I hear if using Frontline (or other spot ons) to switch off between that and other topicals because the resident pests may become immune. So if you're into using chemicals, I'd switch between Frontline and another spot on like Advantage or k9 Advantix.
As for a quick cure...have you treated your home/yard lately? When I used chemicals, I used a home spray that killed and prevented ants, fleas, ticks, spiders, mites, and helped prevent flies. It worked and my pets were fine even if I skipped a dose of spot on.