It's actually kind of astonishing that what villains try to do for an entire campaign is done as collateral damage by you using a first level spell slot, and it only heals 6 hitpoints. Meanwhile, Sad Frank drinks two potions and does the same, but without billions of deaths. Score one for Sad Frank.

You know, this would actually be rad if the DM started using it as a plot point. Extra-dimensional police start hunting the PC for multiverse-level crimes, or some dunamancer in another reality kills an NPC in the PCs' reality to heal one of their friends, and the PCs have to do some dimension-hopping to hunt them down and get them to stop.

Or, like, just reverse the localized time on the individual that got hurt to a point before they took the damage...