onemeower,I am sorry I cannot answer some of your questions,but I have a 13yr old kitty with Hyperthyroidism,before he was diagnosed,he weighed 16lb,but went down to 12 lb's in no time,although he was eating like a fiend.
He's been on Tapazole 5mg now for more than a year,he gets 2,5 pills daily and is doing good,gained 9oz since his last vet-visit.
Your Bandit though seems to have so many other things going on,we have some very knowledgable cat-gurus on this Forum,just have patience and I am sure they'll help you out,ok.
This weekend is Thanksgiving,maybe people are just busy..
"The cruelest animal is the Human animal"
3 kitties,Rocky(r.i.p my boy),Chico,Vinnie