Sulphuric Vortex vs Form of the Dragon

[LotusHead]

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I am at 2 life. Sulfuric Vortex is in pay. I play Form of the Dragon.

Will my life become 5 ever?

[boggyb]

118.5. If an effect sets a player‘s life total to a specific number, the player gains or loses the necessary amount of life to end up with the new total.

So, no -- setting your life to 'become' something is considered a gain or loss of life. In this case it'd be a gain, which Sulfuric Vortex prevents. You die at the beginning of the next upkeep.