So, I just finished the BM main quest, and found it tricky, even with seriously buffed potions. For example, after initially teleporting to the maze (where Hircine gives his first speech), I drank some restore health potions with really long durations, over 5 mins. As soon as I opened the portal and was standing in front of Carius, all my restore health effect was gone. This disappearance of effects happened many times, including when the statue werewolves came to life. It also affected my fortify health potion effects. Totally weird. Is this something to do with the maze? Oh well, I survived, but only after repairing my measly 440-health dragonscale shield about 2 dozen times.... (one hit, one break - man those hounds are strong).