I agree that you need to be fully engaged with your medical team, having said that, so far I've come across practically no illnesses or disabilities that seem to get better from eating more carbs !
a quick check on the internet revealed this blog - essentially she is describing pretty much the LCHF diet we all try to follow here and a discussion forum where people are trying to deal with your issues as well - the heading says colostomy but many of the references are to illiostomy . Most of them seem to involve cutting down on fibre and carbs
Many of us on LCHF have a hard time eating as much fibre as is recommended normally- I haven't noticed any ill effects from that myself .
http://paleozonenutrition.com/2013/...at-put-her-ulcerative-colitis-into-remission/
https://www.inspire.com/groups/ostomy/discussion/low-carb-with-a-colostomy/
Looking at your numbers, it seems to me that what is happening is that each meal you have probably has too many carbs and your system does not recover from processing them before you eat some more of them. so the effect is that during the day your blood sugars keep spiking up with the food and then not returning to base before spiking again. Overnight you finally give your system a bit of a rest, so you get the chance to get back down again before starting the whole process off again.
when most of us get diagnosed, our blood sugars are sky high, that is because we have been through that process too, gradually ratcheting the numbers higher before our system finally sends warning signals enough to get us to the doctor in the form of extreme tiredness etc.
the same process works in reverse on the way back down - cut out carbs, cut out snacks, increase the window between dinner and breakfast and you should see a gradual reduction in the figures.
I now have a 24/7 monitor - the freestyle libre using that I can see exactly that process in action . the monitor thus encourages you to increase the gaps between meals so give yourself time to recover , it also shows exactly what damage constant snacking can does.
I could easily move my numbers back from the current normal/prediabetic back into the full blown high numbers you are seeing - all it would take is to add back toast, potatoes rice , couscous and the occasional packet of crisps and some choccie biscuits between meals. I saw myself how a few days break at xmas moved the figures back up very quickly and how a few days restraint brought the back down again.
Obviously the libre freestyle is quite an expensive option, however with the range of problems you have, I think if there is any way you could afford it, then just a month spent using one and seeing exactly what foods are causing you to go higher and encouraging you to defer eating as you see the numbers gradually drift down, could be enormously beneficial to getting control of your problems. If you also record everything you eat at the same time, then you will have something concrete to discuss with your medical team. take a look at cronometer for that.
Finding this forum was probably your best medical move in years
good luck