When is a relapse not a relapse?

Since I was diagnosed with MS 16 years ago, no-one has ever mentioned a pseudo relapse. I read this article from the MS Trust and now realise I experienced one earlier this year: https://mstrust.org.uk/news/views-and-comments/when-a-relapse-not-a-relapse?bblinkid=262219883&bbemailid=41416966&bbejrid=-1886365665 I also had Covid at Easter, and experienced exactly the same reaction as the author, though I declined the antiviral treatment offered by the NHS. I'm better now, nothing to show for all the pain and anguish it caused me.