I'm getting diseases. I thought I was supposed to be immune. Also, Aela won't give me the totem quest. I became harbringer but as a companion she can die (I thought she would be essential). If I've missed a step don't tell me what it is, but I didn't see too much on the uesp about it.

once your harbinger and can take all the companions with you as followers, they become nonessensial. svcks but thats how it goes. And did you cure yourself when you cured Kodlak? If your still a werewolf and can turn into one, you shouldn't be getting disease. You can get poisoned however.

Yeah the bears (there are a pant load of bears in skyrim) keep giving me bonebreak fever. I'm more concerned about the lack of totem quests. I can still turn into a werewolf and perk it up but I can't actually use the totem perks

I know sometimes the companion quests are bugged. how many radiant quests have you taken for Aela? And is she a follower when you do?