Couldn’t die = invincible and invulnerable from anything or “couldn’t die” from a monkey’s paw wish?

Because the latter might be “couldn’t die because in a few minutes you get a serious accident where you stay in a coma for 4 years and then die”

Something stupid, I was very tired after work and I don’t know why but I found a packet of silica gel in the kitchen shelves, and somehow I thought it was a snack, so I opened it and I have no idea why, I started to crunch on it. After a couple of minutes of chewing the silica gel spheres I woke up and realized my mistake and panicked, maybe those have copper sulphate because are blue, so I called the emergency number. They didn’t laugh of my stupidity and they reassured me that probably I wouldn’t need to be hospitalized. They were so nice that they called me after 30 and 60 minutes for a follow up on my health.