I finally had a chat with a tech who knew what was wrong with my website and told me how to fix it. Yesterday, I completely disabled all plugins (including Disqus comments) as well as taking away my lovely theme. The website started working again as it should.
Over the next few days, I’ll be reloading the plugins and, if that works, I’ll start trying to reinstate the “look” of my blog. Disqus comments are back but you can see them only if you open the post. My learning curve continues.