Battlefield medic

after years of experience surviving in the hell of a battlefield as a medic, you are finally done. this experience might have taken many things of you, but it also gave you a few tricks you can now use to help your allies stay alive.

Shellshock's antidote
you have experienced battle at its most intense, and have gained a tolerance to it. you gain immunity to the effects of short or long term madness (see "Madness" in chapter 8 of the Dungeon Master's Guide). additionally whenever you cause a creature to regain hitpoints when they are afflicted with short term madness, you can cure them of their madness instantly

Stimulants won us the War
you know from experience what wounded soldiers act like, and how to make them fight again. Whenever you decide to heal a creature at 0 hitpoints, you can give them temporary hitpoints equal to twice their proficiency bonus, but at the end of their next turn, they gain 1 level of exhaustion. you can only use this feature once per turn