Im currently trying to complete the vampire skill tree, but after im done can i go to that person who can give me back my werewolf ablitity??

or do i have to go back to an earlier save???

thanks guys

Yes, if you go to Aela she'll change you back into a werewolf, she'll only do this twice though.

Yes, you can go back to Aela. I believe she only gives you one more chance though.