Are these sentences all natural?
I'm dying from envy.
I'm dying from itching.
I'm dying from heat.
I'm dying from stink..
I'm dying from starvation.
I'm dying from hunger.

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Answer

Stink and itching don't sound natural. Try these:
I'm dying from the stink.
I'm dying from itchiness.

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another way to put it using stink and itchiness is to say, "that stink is killing me'; 'this itchiness is killing me'.  We also say "I am green with envy"

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I don't think that these all are natural.