Please. Read. The. Previous. Comments.
I have repeated this so many times because people can't be bothered to read it :/ The OP's gear was so low for the duty that their HP would absolutely MELT (by the OP's own admission, this is not me or anyone else making assumptions). They died twice because the only way to keep them alive through single pulls was to pre-cast heals and then spam those green buttons like there's no tomorrow. And, the cherry on the sundae, the OP then lashed out at the HEALER for not having the split second timing to heal their severely undergeared derrière through the entire dungeon. And in case you skipped over that, they were tanking with healing and DPS trinkets, so they only met the Minimum Ilvl by cheating the system with gear that contributes very little towards their tanking stats.
If you acknowledge and understand all of the above and still believe OP was in the right and the healer was at fault, then let's just say we don't agree on what constitutes proper dungeon etiquette and leave it at that.