Help!!! I cant even beat Wiegraf before he transforms. Each hit does 168 damage and i only have 213 hp. I cant keep away from his hits and i cant heal fast enough (only heal 23 hp at a time). I need help!

Im using bloody strings, holy mitter (need +1 mag or he kills me in one hit), forgot which armor, but best i could get, and sprint shoes (need so i can move first)

What do i do?!?