It seems true that bad luck comes in three or even more

No 1. Oil seals were leaking. I've just changed the timing belt 2 years ago and the car has just done 30,000km since then.
No 2. Found the front sway bar has snapped.
Took it to mechanic, changed all five seals, timing belt, water pump, pulleys and front sway bar.
Yesterday, the mechanic called to pick up the car.
No 3. The exhaust note has changed

No 4. I could hear a whining sound when it's idle and it goes louder on acceleration.
Asked the mechanic why it's whining, he said it's normal after timing belt change and it will go away after a while.
Is it true or the mechanic has just F**KED my baby?

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