Took me a few tries I think around 5 or 4 you just have to take out the small minions and then when you meet the final one you have to go long range for a while and then heal. Or if you have full health go close range and the retreat and heal ur self then keep repeating until u win
ouch - yeah it's a tough fight, the advice ash gave is the way. If you gotta heal right off the bat try to maintain distance and use your ranged attack on the mob until your heal is closer to its cooldown