Your raidsay lines are in the wrong place. You have them completely outside the tags, which makes them malformed information (ie ignored).
You need to put them right after the actual spell cast. Try this:
</Page>
<Page Name="Dirge">
<Data Name="Button1" Macro="SpellForMyLevel='1033316620'
useabilityonplayer Parent.Target SpellForMyLevel
raidsay Rezzing Parent.Target" Tooltip="(44) Elegy at Death's Door"/>
<Data Name="Button2" Macro="SpellForMyLevel='3390154729'
useabilityonplayer Parent.Target SpellForMyLevel
raidsay Rezzing Parent.Target GROUP" Tooltip="(58) Elegy of Awakening"/>
<Data Name="Button3" Macro="SpellForMyLevel='1492846922'
COND=(Parent.Parent.Parent.Parent.Custom.ProfitUI_QuickRaidButtons.ActualLevel.T ext < 78)
SpellForMyLevel=COND ? '847451313' : SpellForMyLevel
useabilityonplayer Parent.Target SpellForMyLevel
raidsay Here Parent.Target I'm giving you some of my life - stifled for a few seconds...
gsay say Here Parent.Target I'm giving you some of my life - stifled for a few seconds..." Tooltip="Oration of Sacrifice Line"/>
<Data Name="Button4" Macro="SpellForMyLevel='3677033782'
useabilityonplayer Parent.Target SpellForMyLevel
raidsay Gravitas on Parent.Target" Tooltip="(80) Gravitas"/>
<Data Name="Button5" Macro="SpellForMyLevel='3601331586'
useabilityonplayer Parent.Target Confront Fear
raidsay Removing Rez Sickness or some other effect from Parent.Target" Tooltip="Confront Fear"/>
</Page>
Note that the new commands are inside the quote, with each command starting on a new line.