My wife and I both had it in late March. We were lucky I suppose as it wasn't much more than mild flu symptoms for a couple of days. We didn't get much of a reaction to the injections either. By the time we got it I think we'd have three vaccinations and we've had another one since if my memory serves me correctly. We still got it, but if we hadn't been vaccinated I think it could have been far worse.
It seems to have a wide variety of reactions. Some people are sick for a week just from the vaccinations (some of them fairly young), and others like us just felt a bit lethargic for a day or so. We didn't even have a reaction to the third and fourth vaccinations other than a sore arm for a couple of days.
"Long Covid" appears to be very debilitating, sometimes leading to something like Chronic Fatigue Syndrome.
About all you can do is hang in there, and gradually build up your strength and resistance. I suppose living in a cold climate doesn't help, whereas we're in a sub-tropical climate here.
PS - You're probably sick of reading about it, but there's an article here from the Australian Broadcasting Corporation.
Wondering if that brain fog is a symptom of long COVID? Here's a look at the symptoms and what help is on offer near where you live.
www.abc.net.au