I got low on mana also (in my theorycraft). So I prepared before for it. I got the 4 mana/5 enchanting oil. I got 5/5 imporoved mana/healing totems on 3 chars. I got the 550 food (stam/spi). I got a regular mana pot (the square looking one). I couldn't cast much, so I just melee'd and shocked. I put down a fire (cooking). I put down my stoneskin, strength, (no stoneclaws), searing, healing and mana and grounding totems. I tried to focus on one mob and keep my lightning globes up. I did it at 38. I have mostly eagle and owl gear. I used 1H and shield with windfury on weapon. Not sure of what really can help, just try to get as many buffs as you can and hope for the best.