i cant do diablo hell

[[vL]Kp]

use Healing a lot instead of buying red potions

No disagreement about the relative yield of reds vs. blues, but there is one advantage to healing potions: they're instant, and as such cannot be interrupted. Healing requires that one stop shooting long enough to cast a spell, which may not be practical if you're being swarmed. I'd suggest carrying along a few reds for emergencies, but use the Healing spell whenever possible, as Mystery suggested.