Need Some Shaman Advice In Everfrost

[Gumbo]

I'm a level 12 Barbarian Shaman and was thinking about soloing Mammoth Calfs in Everfrost. I tried it once by casting Tainted Breath and ran away with SOW and than I would cast Sicken. The only problem is it seem the Mammoth Calf was taking less damage than what I was able to keep for mana.

I have checked out hunting guides for advice but what would the best spell setup be if I want to solo Mammoth Calfs, survive and not run out of mana?

Thank you...