Fair that you deleted argumentative posts, but I see all of the snide comments from "Pioneer Valley Web Design" -- making me look like a total idiot -- remain. I've searched this forum and seen that he's done this to many people. It's really frustrating and disappointing, but I'm so glad more people have chimed in.
I didn't mention it in my OP, but I have taken many of the steps to prevent this from happening again, so I feel that aspect of things seems to be taken care of. (Knock on wood) That's why I didn't ask. The real question that I had and I still have is still what to do with the old posts. Additionally, I've seen a lot of these posts mentioning corrupt or changed php files; in this case, my individual posts prior to 1/15 seem to have all been edited, which is something I haven't seen a lot of talk about in any of the many pages I've checked on this.
Ipstenu, I appreciate that link you shared. I did find "ftp_credentials" within my wp_options which I wouldn't have noticed to look for without your link, so thank you.
Perhaps you are right, Jan, that I should look into a professional for help on this (and being nice about it). I do have my web hosting people on it to look for solutions, but I know I may have to go elsewhere for the root of the problem. I still have additional worries there, including cost or trustworthiness of the person doing the fix, so, of course, there are associated worries there. But thank you both for giving me some helpful tips.