My whole's power is great

Question

Own my prefix to give you happiness;
Take on my infix to give you stress;
My suffix means to hesitate;
But my whole's power is great.

What am I?

Note: edited first two lines for clarity

Hint 1:

The prefix, infix, and suffix are all between 2 and 4 letters long (inclusive).

Answer 1

I think I got it now.

petroleum

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⋅ Owning a pet gives you happiness.
⋅ Taking on a role gives you stress.
⋅ um means to hesitate.

Second Answer:

Better than my first answer but not the intended solution (given the hint):

momentum

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⋅ Having a moment to yourself gives you happiness
⋅ an omen (or men) - can give you stress
⋅ um means to hesitate

Original Answer:

Probably not what you're thinking of but I found this...

Magnetopause

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⋅ Magnet is sometimes a toy which can give you happiness
⋅ A net upon you would likely cause stress
⋅ Pause means to hesitate