Healing Stun, Why won't magic work? Options

[Mordinvan]

As I understand it, most stun damage is a combination of exhaustion, bursing/strains, and pain. Each of these symptoms can be fixed individually with magical spells, but lable them as stun, and suddenly they are unfixable. If the stun if from magical drain, or a mana based stun spell I can understand that as having suppressed the targets spirit without actually damaging it, and it just takes a while to stoke the furnace again to get it running properly. But how is the damage inflicted from a gell round somehow immune to being repaired by the same method which would fix the hole left by a 44. magnum slug, when the pain can be treated, the brusing can be treated, and even the unpleasant memory of having been shot can be removed?