Hi Doons and welcome to NeuroTalk

I think perhaps kiwi33 misunderstood, thinking that you were referring to Covid vaccination, when in fact you said you had contracted Covid infection.
(Just an FYI that I know many people who have reported fluish symptoms for a day or two post vaccination and/or booster, and it is even listed on CDC)

Yes, most people who have Covid infection do experience symptoms of cold/flu.
Also, it does seem that people who have a pre-existing illness will often feel those symptoms ramp up during their Covid infection (as they often do with any additional illness). Covid does appear to impact a number of the body's systems in various degrees in different people, and so that may well be the reason for your PN ramping up.
As always, it may be a good idea to discuss this with your physician.
Hope you recover from Covid soon and completely