Superman 'Imaginary Story' Late '50s - Early '60's

Over four years late with this answer, so this may no longer be useful to you, but on the off chance it is, I believe you were thinking of Superman Vol 1 #160, published in 1963.

Near the beginning of the issue, Superman comes into contact with some Red Kryptonite particles, which cause him to lose his powers.

Subsequently, he's shot in the torso as part of a charity event, but is protected by his invulnerable costume.

Later still, some thieves shoot poison darts and arrows at him, and one of the darts nicks his ear, causing him to become dizzy. After the thieves flee the scene, he staggers away and falls into a river.