Adults certainly can get whooping cough. The vaccine wears a bit thin over the years. I had a bad cough, picked up in Australia when I visited my son in NZ this year. The week after I left (still coughing) he got truly a terrible cough, complete with whoops. I coughed for weeks after I got back. I think we both had whooping cough.
Currently there is rather a lot about which is why the NHS are recommending a booster to all pregnant women in the hopes that it will boost up their antibodies and newborns will be protected. They can become dangerously ill if they catch it. There have been several deaths this year.
I think the only thing is - stay away from newborns if you have a bad or persistent cough.
Miserable nanaej . I made a marmalade, ginger and hot water concoction which helped.
But if doesn't start to get better soon, go back and bother your GP in case you need further investigations. There are many things that can cause a cough.