I do think your reaction is not very common.
What is it about a lockdown that frightens you?
See, a lockdown for 5 days is not, in most peoples eyes, serious. It could be labelled "inconvenient". We get our social plans interrupted and for those that work they are messed around but overall it isnt a huge issue but to you it is.
So, I do recall vividly when my anxiety was off the scales many years ago. My therapist asked me how the week had gone and I told his I had intrusive thoughts about stuff like if my boss knocked on my door or a relative passed away. He asked me if my thoughts were realistic. "Not really" was my answer. And so he reminded me each visit if I had asked myself "is that thought realistic"? And I did each time. Eventually my mind changed, I began to discount unrealistic thoughts. Repetition does work.
Panicking has a direct and indirect effect on our lives. I can effect us physically by way of future heart and stoke issues and mentally too. Apart from asking yourself "am I being realistic"? a practical method is to create your own distraction. This could come in the form of a hobby, interest or sport. Focussing on sewing or knitting your mind might wander towards intrusive thoughts but not to the intensity as when you have little to do.
I've found some threads you can click onto. These can help you get things into perspective.
The last thread is an important one. It goes through the process of how I eliminated anxiety. It took many years but rest assured if you do not take positive practical steps towards doing so then you cannot proceed, you'll always be suffering. It means a cocktail of remedies- medication, exercises, environment concerns, work, removing toxic people from your life etc etc.
What do you think?