ok, my only two choices are to become a vampire and give up my lycanthropy, or give up a piece of my soul and severely weaken myself?

wow, that is... just crap.

i read that aela can give me lycanthropy again... but just ONCE more.

so, is that my only choice... become a vampire lord, complete "beyond death", then go become a werewolf again?

or is there a way i can regain my soul inside the soul cairn, and get rid of the "weakened soul" curse?

it seems odd to sacrifice a piece of my soul... so i dont wanna do that and cripple my character unless i can get it back... so can someone tell me if thats possible, or is my only real choice to become a vampire lord for the length of this quest?

i suppose this is exactly why they provided us with a second chance to become a werewolf with dawnguard, since we're practically punched in the face and forced to become a vampire during the main quest.

Yes you get back to full strenght. The penalty applies only to the length of the Beyond Death quest.