Mid 20s non-smoker.
All my life I never used to get ill however a couple of years ago I started coming down with what seemed like recurrent cold after cold, with lingering symptoms for months each time. There would be a short period of finally getting over it, then the process repeating. It rarely felt like a typical cold (the ones I used to have which lasted the normal time of a few days to a week). Just tired, weak and feeling strange, with chest/nasal mucous. The day before I'd always know I was coming down with whatever it is.
I've been given a few antibiotics as my GP suspected infection but they weren't effective.
I had a spirometry test which was normal.
I'm thinking about a private chest x-ray now... I don't know what else it could be. I'm starting to worry it's something sinister.