A big thanks to Rick who commented on my last post with some valuable information. It underscored my hopes that I don't have a stress fracture, and I think it's quite obvious now that it is indeed just a pulled muscle or ligament in the foot.
Resting it the past several days is helping. However, I only saw minor improvement up until this morning. If I were to quantify it, I'd say it improved 10% up until yesterday, but since I woke up this morning I'd say it's lept up to 40% improvement. So, if the numbers are true, I still have 60% to go, but hopefully that'll take just another week. Even when I reach zero discomfort, it would be smart to still wait another two days before going for a light test run. We'll see.
With the extra time, I've put it towards writing. First draft should be wrapped up in about a month. Very happy with it and am having a blast, especially with the chapter I'm working on now. I've even come up with a title for the book and think it's perfect. I'll keep that card close to my chest along with the others for now though.