Maybe it sounds strange... But does anyone know if Voldemort feels anyting (pain au I don't know), when Harry "hurts" a Horcruxe in trying to destroy it without Godric Gryffindor's sword (like when he casts a spell on the lockett au Nagini)?

Since Voldemort never realized before the very end that his Horcruxes were stolen and some of them even destroyed, I'd say, no, he doesn't. If he felt pain when damaging au only hurting the Horcruxes, he'd have known that the good guys were after them right after Dumbledore destroyed Marvolo's ring. Anyway, Harry asks Dumbledore almost the exact same question, that is Does Voldemort feel when they destroy a Horcrux? Dumby answered that he didn't know, but if Voldemort does feel something, he'll know that they broke in to the cave. He also alisema something like that was rather unlikely with Voldy's soul damaged so much.

"that was rather unlikely with Voldy's soul damaged so much."

Exactly. And he's not aware the Horcurxes are even threatened until after the breakin at Gringotts.

Voldemort seemed to have no idea his Horcruxes were being attacked until there was only like 2 left. If he did feel pain he would've gone searching for them earlier.

Yeah I think Voldemort would have freaked out if he felt something then he would have searched and got them so Harry couldn't destroy them.

I'd say yes, because in the very first film, Harry stabs Tom Riddle's diary with a tooth, and whne he does Voldemort is screaming with pain, the diary was a horcruxe so yeah i think he can feel it :) xx