Re: Sick feeling in my stomach..
I have had just had mine replaced on my 147 2.0TS due to failure !!
52K miles, with only two months until the end of warranty !
As luck would have it, it went about a mile away from an alfa dealer in Norwich, who were great. I am in my third year (didn't think it would be covered bu it was!)
New cyclinder head was needed also, the garage reckons it would have been about £3.5K !
My recommendation: get it done as soon as you can/afford.
Others may not be as fortunate!