If Feeburt is positive for IAA, you will try to overcome the antibodies...you will give more and more insulin and aim for "normal" cat numbers (green). It is possible for IAA cats to go OTJ. Jan/Buddy; Sharyn/Fiona; Sandy/BK all have IAA.
If Feeburt has acro, you basically have 3 choices.
1. Go to CSU for the stereotactic radiation surgery
2. Enroll in the drug trial that will be announced soon by CSU. However, this is a temporary treatment...once the trial is over, the meds stop and they are too expensive to buy. I don't know what the cost of the trial will be.
3. Treat only the diabetes; your goal here is to keep him under the renal threshold but out of the lower greens. His pancreas is fully functioning so there is no healing to be done (although it is possible to go OTJ for a while). Your goals here are to prevent kidney damage, prevent hypo, yet get enough insulin in him that his body can function.
Note that it is possible to get "regular" radiation for acro, but it basically costs the same, is much harder on the kitties because they have to be put under many more times, and is much less effective. Really, not worth it.
You might as well pick up a bottle of Humulin R. No prescription is necessary. You won't use it until someone can help you but at least it will be sitting in the fridge. There are two threads in High Dose about using R w/ IAA cats and with Acro cats. Those would be good to read just to have an idea of how R helps.