Translation of pájaro carpintero

I grabbed a burger from an American fast food chain and swallowed it immediately, as I had not eaten for a while. I boarded the machine and could feel a slight stomachache but decided to ignore.
Today, during the peace process it is very difficult for both parties to suppress their feelings since the recollection of what occured in the last decades are strongly rootes in their minds.
We went to eat dinner at an Indian restaurant an my wife and I were afraid that it would turn our stomace upside down, just a day before we had to take the long train journey back to the capital.