[aliem]

I'm currently using rFilter2 (cooldown and buff tracker for yourself and your target) and an automatic shard deleter (as affliction i just dot my target drain-tank and drain soul his last hp)

rFilter2 config:

rf2_spell_list = {
        buffs = {
          -- Shadow Trance
          [1] = { tag = "trance", spellid = 17941, unit = "player", size = 48, fontsize = 18, posx = 0, posy = 170, framestrata = "BACKGROUND", anchor = "UIParent"},
        },
        debuffs = {
          [1] = { tag = "corruption", spellid = 172, ismine = 1,  unit = "target", size = 24, fontsize = 18, posx = -64, posy = -100, framestrata = "LOW", anchor = "UIParent"},
          [2] = { tag = "agony",    spellid = 702, ismine = 1,  unit = "target", size = 24, fontsize = 18, posx = -32, posy = -100, framestrata = "LOW", anchor = "UIParent"},
          [3] = { tag = "weakness",    spellid = 980, ismine = 1,  unit = "target", size = 24, fontsize = 18, posx = -32, posy = -100, framestrata = "LOW", anchor = "UIParent"},
          [4] = { tag = "immolate",    spellid = 348, ismine = 1,  unit = "target", size = 24, fontsize = 18, posx = 0, posy = -100, framestrata = "LOW", anchor = "UIParent"},
          [5] = { tag = "embrace",    spellid = 32385, ismine = 1,  unit = "target", size = 24, fontsize = 18, posx = 32, posy = -100, framestrata = "LOW", anchor = "UIParent"},

          [5] = { tag = "fear",    spellid = 5782, ismine = 1,  unit = "target", size = 24, fontsize = 18, posx = 0, posy = -75, framestrata = "LOW", anchor = "UIParent"},


          --172 Corruption
          --348 Immolate
          --702 Curse of Weakness
          --980 Curse of Agony
          --5782 Fear
          --32385 Shadow's Embrace
        },
        cooldowns = {
        },

there are many alternatives like EventAlert (for shadow trance/gliph of corruption) and DoTimer (it can track multiple target's dots)
btw as warlock you just need to know your and your pet's cooldowns and your target(s) dot ... and obviously your mana pool along with your hp