I've decided to roll up a Gestalt Character who's a Unbreakable Fighter/Invincible Rager for the sole purpose of being a true "unstoppable force". He's built well, and can withstand a lot (especially with a Defiant weapon). However, what I'm looking for is a way for his damage output (or amount of kills racked up) can net him some HP. Fighting for so long can be tiresome and really tax his HP, despite the negation. He is an expert in dealing with wave after wave of enemies. While he won't kill everything the fastest, he will most assuredly be the last one left standing.
So, besides a Vampiric Weapon, how else can I heal from damaging or killing foes? Buff spells from allies will work for this as well, though I don't want a Life Cleric basically rammed up his behind the entire time. Looking for magic items, spells, feats, etc.