It's making me so upset because this big stupid dragon that was supposed to be helping me keeps getting injured. Then during the entire fight he's just kneels on the ground all submissive like and keeps yelling use Dragonrend. Half the time I hit Alduin with Dragonrend he keeps flying like I didn't do anything. Then when he finally lands I'm attacking him with a power enchanted glass great sword, but it's having zero effect. It's not even scratching his life gauge. --- This thing is all about respect. That's what its all about.
Depends. Are you playing as a warrior/tank? If so, your armor and health should be high enough to protect you from most of Alduin's damage. Well, as much as can be expected when fighting the freaking world eater. When I fought him first, I was only level 25 or so, and my weapons were hitting at about the same damage as yours (I think my enchantments were a tad higher...25 fire damage). Use the full dragonrend shout, and attack near the wings. I think I dropped him in 20-25 hits.