I fell ill on 8th Nov, tested positive on 13th Nov, got pretty sick but was fully back to normal with no fatigue or much of a cough by 27th November.
Whilst sick my cough was minimal, just a dry irritation amidst the utter horror of the rest of it really. In the nearly 3 weeks since feeling better, I've had days where I've coughed a bit and had a tight chest, and others where I've not coughed at all.
Today the cough has suddenly become quite bad. But why would it suddenly worsen now? I can't work out if it's a new cough, or the old one. I'm really quite wheezy and can't talk without coughing, I've gone backwards. 
Is this a thing? I know about post viral cough etc, but I wouldn't expect to have had a couple of weeks gap before it started...