Thanks for replying, Lora W.
I'm about 14-15 hours in. Generally achy but not so much that laying down is the only option. Walking and standing up is a chore. I can do it but my body is really leery of doing those activities for more than a moment. When I went outside to retrieve the newspaper, I walked very casually as opposed to walking quickly or even lightly jogging. I don't have a lot of brain fog (I'm typing this reply out, after all) but, especially when standing or walking, there's a bit of lightheadedness. Injection point is sore and I can lift my arm 70% before significant discomfort occurs. Ate 20% of normal breakfast volume without too much difficulty but had zero appetite.
Overall, I almost think that this reaction is somewhat milder (but not mild) to what I was expecting as, I've written previously, my reactions tend to be strong. I am really glad that I am not going into work today (I normally wouldn't on a Saturday) but even if I could remote in (which I can't), I wouldn't do it.