Hi Gary,
there have been many people in the UK with exactly the same symtoms as you describe. Both myself and my wife had a cold and the resultant cough for about 4 weeks. We had our flu jab late October, our 4th covid jabs in early Nov. My wife picked up her cold in mid-December and I got it a few days later.
From what I have read flu deaths are very high this year in the UK, not sure if it's the same in Spain. I feel it is the partly a result of people not being exposed to these bugs due to covid restricitions over the past couple of years helping to stop the spread.
The article below was in the Guardian late December, interesting reading.
https://www.theguardian.com/science/2022/dec/30/flu-covid-rsv-britain-ill-bugs-viruses
Hope your better soon.
Aitch.