if you're a stealth character why are you letting yourself be seen?
Put some perks into your stealth rating, snipe and retreat if you have to.
You know the windhelm companion quest where you have to invade a giant camp? I took out the mammosks and giant on the outside of the camp with nothing but iron/steel equipment at like level 15 by hitting them with bow sneak attacks and retreating. Was able to do the same hting with the giant inside the cave although it required someclever maneuvering and non-sneak attacks/retreating from the cave... and a few attack dodges.
felt like a badass hiding against a cliff while two mammosks and a giant were walking right above me on the cliff edge looking for me, hearing the footsteps and seeing the ground shake from the mammoths, knowing htat if I was spotted, I was dead.
The only perks I had enabled PERIOD on my character were the +20% sneak perk and the bows do 3x damage on sneak attack perk. And I took out two mammoths and two giants. With iron and steel equipment. no potions or anything.
Ifthere's a group of enemies you're fighting, try to fire off an arrow to catch their attention, and only one of their attentions. Then you can lure it away from the group and take it out, and rinse and repeat.
Yeah it'll require lots of reloading, but you can do it