Possibly sick BP, could really use some help figuring out if it's a big deal or not

[Homebody]

So the vet is fairly confident that it's not septicemia, and that the first vet (the one in my home town) likely just completely misidentified things. That being said, she did agree that the other symptoms were some cause for concern, just not immediate life or death concern. The plan was to draw blood for tests and send me home with antibiotics to give him over the next month, but they were unsuccessful in drawing blood, so the new plan is to start the antibiotics and monitor him closely over the next month. I may or may not (depending on how he responds to the antibiotics and better managed heat) bring him back in about a week and a half to try for the blood draw again.

Good news regarding septicemia. What did the vet say about the scale rot? I think that would be my next biggest concern.