When mrds try to burst me i just use sacred prism and throw divine seal + regen on me.
If i feel a bit silly then i'll just use equanimity and spam stoneskin. It's so awkward when a tank tries to 1vs1 me after using the above.
What baffles me is 8/10 tanks will blow all their cool downs on me when i have attunement up.
Other than that, just burst down a dps cuz if you're chasing and not making any progress with killing the healer for a good 1-2mins then you know it's about time you switch to someone less sprinty.
I sometimes use divine seal regen -> sure cast -> stoneskin -> shroud -> PoM -> stoneskin -> stoneskin -> stoneskin -> stoneskin -> stoneskin -> equanmity -> cure 2 -> medica 2 -> stoneskin -> regen -> attunement etc. whm can literally tank till getting hit with LB1