NeedToKnow 

NeedToKnow: Simple, effective timer bars

Track specific buffs, debuffs, and cooldowns with bars that always appear in the same place in the same color. NeedToKnow is great for short buffs and debuffs you use a lot. For example, a rogue could show bars for Slice and Dice, Rupture, and Garrote.

• Easy to set up
• Works with spells, abilities, items, totems, procs, and internal cooldowns
• Track more than one spell or ability with one bar
• Works with Retail and Classic WoW

• Save setups for different specializations
• Track by name or spell ID
• Show cast time indicator to see when to refresh buffs and debuffs before they finish
• Make bars deplete at same rate to see which will finish first
• Blink bars when buff or debuff missing
• Track buffs on raid members without having to focus them

The bars only time things when the addon is locked. Type "/needtoknow" or "/ntk" to lock/unlock the addon. You can also use the buttons in the AddOns tab of the Blizzard Interface Options menu.

Check your spelling and capitalization. Also remember that buffs and debuffs sometimes have different names than the items and abilities that apply them. The Death Knight ability Icy Touch, for example, applies a DoT called Frost Fever. If you're using a SpellID, make sure you have the correct one.

Enter the name of each buff/debuff separated by commas. They are prioritized according to order. For example, "Rake, Lacerate" will display Rake until it expires and then it will track Lacerate. "Curse of Recklessness, Curse of Exhaustion, Curse of Shadows" is a good way to track single-instance curses.

You can enable more groups of bars by going into the Interface settings off the main menu and choosing the AddOns tab. If four groups of six bars isn't enough for you, consider another timer bar addon. Also consider rethinking your UI.

Select "Only show if cast by self" in the bar's configuration menu.