My wife and I are just getting over Covid right now. My wife has a weak immune system due to chemotherapy, and her case was pretty severe. They put her in the hospital due to low immune system, then found she had Covid too, so she went in the isolation ward. However, they let her out, because there were a lot of cases worse than her, and they needed the bed space. They were having patients going into crisis status left and right. She came home and it was touch and go if she would have to go back to the hospital. If she went back, she could not have visitors, and I worried I'd never see her again after I dropped her off.
My own case wasn't as bad, except it aggravated my sleep apnea. I have a CPAP machine that I haven't been using because I couldn't sleep with it, and the apnea didn't seem that bad. With the Covid, I would wake up gasping a few minutes after dropping off to sleep, and my oximeter would show blood oxygen levels as low as 60, which is radically, dangerously low. I got my CPAP machine out, and it enabled me to control the breathing lapses. After that, I felt fairly sick, but I recovered and am doing fine. My wife is doing fine now as well.
My wife and I had super bad colds in late January and early February that lasted two weeks. We wondered if this was Covid, but I can now say it was not.
Based on this, I don't think the bad cold/flu that went around in Jan/Feb was Covid. If you get the real thing, you will know.
Even having had it, I will say the lockdowns are not justified.