shaman spell Frenzy, when was it changed?

[bakkily]

i use to use frenzy all the time back on my other shammy, stacked with chloro

but only have regen/frenzy, but with frenzy it sucks my mana down fast, while i regen hp fast, or is my guy bugged? even if i canni with it on, still sucks the mana

after my mana is sucked down, and am full hp, then mana regens upagain like normal, with frenzy still on me, i can canni, and its all normal, but the first minute is strange, just havnt been using it lately, and i wont unless in dire emergency to where i need hp fast