...Turns out it was 1d4. But yes. And you can get Necrosis Carnexes up and running (if they can stay alive, with this DM that may be hard) for even more healing. You can also use AoEs your immune to on your own position when you get swarmed. Consider an Uttercold based build for example... you nuke on your own position for half cold, half negative energy. If you can get immunity to cold somehow, you can heal yourself while icing your enemies.
JaronK