I have read a few posts on here about hearties having continuous colds and thinking it was their meds. I've had cold symptoms for six or so weeks, and the pharmacist I consulted about it wasn't sure what was causing it, as colds shouldn't last that long.
Now I'm not saying there isn't such a link, but I was having a conversation recently with a PICU doctor (paediatric intensive care unit) at GOSH when he mentioned that since Covid reared its ugly head, and much more so recently, they have found patients get a series of colds, one after another, which present as one continuous cold.
I merely mention this as it may be useful information, not being something I have heard anywhere else.