How to successfully battle Revered Dragons?

My character is level 63 and uses melee weapons - mostly a one-handed ebony war axe.

• Level a ranged ability, preferably archery. When the dragon lands somewhere out of melee range, or is hovering, you ought to have a strategy for hitting it other than "cast Dragonrend and then run over to it." That's too slow.
  • Destruction can work as well, but it is poorly leveled in vanilla Skyrim. If the expert-level spells aren't strong enough, you may be out of luck.
• Upgrade to dragonbone weapons.
• Upgrade to dual wielding, and get the perks that make it faster. This greatly increases DPS, and blocking is less useful at higher levels in my experience.
• If your equipment is not tempered to Legendary already, go level Smithing:
  • Complete Unfathomable Depths, get a good night's sleep, activate the Warrior Stone, and then...
  • Go to Halted Stream Camp outside Whiterun, collect a bunch of iron and the guaranteed Transmute spell tome, then smith a bunch of silver and gold jewelry. You can then enchant and sell it to level enchanting and speech respectively, and you'll also make a decent amount of cash from this process. If you sell to the teachers at the College of Winterhold, you can immediately purchase training services from them, and the money will go back into their inventory. Then you can sell them more stuff.
  • Go through (your favorite Dwemer ruin), collect all the smeltable items of weight 2 (the heavier ones aren't worth it unless you have lots of extra room in your inventory), chop some firewood, then make a ton of Dwarven arrows (which are weightless).
• Enchant your weapons. Don't bother with paralysis, it doesn't work on dragons, but there are quite a few enchantments that give a significant increase over base damage.
• Potions and poisons can greatly increase your damage output. Lingering damage poisons can negate healing effects and do a lot of damage overall (assuming you're dealing with a battle that will take a long time anyway).
• Have a follower distract the dragon once it's grounded, and attack it from a distance. Make sure they have good gear and a reasonable maximum level. Many followers cap out at 30 or so, and those followers are useless for high-level fights.

I have the aetherium crown which 'contains' the atronach stone, but apparently magic absorption doesn't do anything to drain vitality.

• Be at the armor cap (displayed value of 542 with a shield, 567 without a shield, but you must fill all four armor slots). You can do this with smithing alone, but the Lord Stone makes it significantly easier. This only protects against physical damage (e.g. the dragon's bite), but at a high Smithing level, it's so easy to reach that you may as well do it anyway.
• A couple of tricks which don't work on Drain Vitality, but do work on most other dragon breath attacks:
  • Have 85% magic resistance (25% from the Lord Stone, 15% from The Book of Love, and enchant some of your gear for the other 45%).
  • Have 80% spell absorption (50% from the Atronach Stone, 30% from the Alteration perk).
  • Have 85% resist for each of fire, frost, and shock. This stacks with magic resistance. I recommend using potions for this, as you may be running short on enchantment slots and elemental resistance is more situational.
• Potions of regenerate health will effectively cancel the most deleterious effect of Drain Vitality. The Argonian racial skill Histskin will completely negate it and then some, but only for 60 seconds per day, so it's probably not a good strategy.
• Don't bother with potions of fortify light/heavy armor, you're already at the armor cap.
• Level Restoration and learn (better) healing spells (purchase from Colette Marence). Use them.

And finally, the extreme option:

• Become a Vampire Lord via Dawnguard. The VL form is ridiculously overpowered, but makes most people turn hostile on sight.