"Should I be really pissed off with this or is this just a case of 'unlucky, fact of life'...."
I would say you have every right to be pissed off and also that it is a case of being an unlucky fact of life.
Maybe a few other people also got retrenched as a result of you shipping work offshore?
I wonder what their take on it is?
Unfortunately doing what is right for the company, often doesn't lead to the recognition you may think you deserve.
Contrary to what management gurus tend to preach, the people who keep their jobs, are usually the ones with the brownest noses, rather than the ones who actually do something.