I have always hated "What doesn't kill you makes you stronger."
(cue crappy-ass pop song)
I call BULLSHIT. What doesn't kill you leaves you scarred and limping; don't try to sell it like it's a good thing. It's people trying to make suffering sound like a good thing and it's not. That's why we call it "suffering" and not "fun." If I get hit by a truck or get cancer, that doesn't make me stronger. It weakens me physically and maybe even mentally or emotionally. If I survive it, then good for me but don't sell me the "see how strong you are now?" bullshit.
Just acknowledge that I suffered and say, "Gee, that happened to you? That really sucks," because, yeah, it does.
Amen! You may discover how strong you already were, or, like you said, you may just get weaker.