I, and other people I know from different social circles, have had Covid over Xmas and it’s all similar symptoms - basically that of a head cold, without the big coughing and lung shenanigans of previous waves.
I’m in Dublin and in the space of a few days, it went from me not knowing anyone who had covid since the start of it all, to several friends, who don’t know each other, getting it in a space of a few days. It’s essentially everywhere here - case levels are at record levels yet many people can’t even get PCR tests as the testing centres are maxed out - the website to book them gets booked out just after midnight everyday when the new day’s appts are available.
It will be interesting to see whether the longer term effects of Omicron are also milder, as these have been more of an issue for me than the actual symptoms while infected.
I tested positive in late October, so this was presumably Delta virus as it pre-dated Omicron. The symptoms while isolating were exactly as you describe - a head cold without a significant cough or lung issues, thankfully (no doubt helped by being double-vacced at that time).
When my nose cleared up I realised that I'd lost my sense of smell, albeit I could still taste most things as before. I've gradually regained a bit of the sense of smell, but it's still nothing like it was pre-Covid. Over Christmas I realised that my sense of taste is also not 100%, most notably from eating hazelnuts and walnuts which I literally could not taste, even if I chewed them for a prolonged period of time to try to force me to taste them.
The bigger issue for me was that I discovered that I got easily fatigued from mild exertion. I tail-walked a local parkrun a couple of weeks after my isolation period ended. The course has a long drag of a hill on each lap and I discovered that I was getting light-headed as I went up it each time. Oddly, the sensation never quite disappeared for the rest of the day and I felt 'off' for the rest of it, to the extent that I abandoned plans to go to the football and to a gig that evening.
The impact has been that it has made me very cautious in terms of doing too much, as it has been an intermittent symptom that could get triggered quite easily. For example, I got dizzy climbing a single flight of stairs at work on a couple of occasions. It's pretty much gone now, albeit I haven't yet attempted to do any meaningful running or high-exertion exercise.
For anyone testing positive over Christmas (and like Andrew, this seems to have been loads of people in my social circle) I would suggest a little bit of caution regarding whether or not you have any longer-term symptoms. Some, like the sense of smell, might be minor inconveniences but the energy level thing, for me, has been something that I've had to be mindful of and treat with more respect.