Randall and I talked it over last night before bed, and I mentioned my strong concerns that taking Elvis completely off his heart medicine without putting him on a replacement was just not a good thing to do. Randall agreed and suggested I go ahead and get the Vetmedin back in the rotation and reevaluate his behavior Thursday night.
So this morning, that's what I did. He acted his normal, goofy self when I got up, so his heart pill was in his morning dish. Considering the banging and rattling that was done in here yesterday, and the fact I have a bit more to do in the den before I'm done (and that's where the crates are), Randall will move his crate into the living room before I get started in here, and Elvis will go in there until I'm done.
I'll be calling the clinic Friday morning to give them an update, so if I am still seeing behavioral weirdness by then, we'll go get the different medicine. The problem is exacerbated by the fact we've got company coming in over the weekend, so it's a bad time for emotional problems. Ultimately it doesn't matter because his health is more important, but it's still a bad time because we're so busy for the next week.
I'll report again either this evening or in the morning on how he's doing.