Options-Tools-Profiles, then make a new profile, call it heal, and check off spec1 (or spec2 if your heal spec is actually number two in your talents tabs). Hit save. Then make another profile, but in this one, go to Options-Move! and kill all the panels (keep pressing on red X next to the panels until they all go away). Then go to Options-Tools-Profiles, and check spec2 and hit Save. Now it should switch as you swap specs, from your healing profiles to the other one which is empty.