Welcome to the forums and
I'm really sorry that you appear to have been landed with a heavy dose of autoimmune conditions, though luckily the DKA is something that normally only happens at first diagnosis. (It's caused by insufficient insulin and high blood sugar, so as long as you have access to insulin and test your bg, you should be able to avoid it.). It sounds like you are going to have to live with the rest, unfortunately, but T1 does genuinely get easier to manage with experience and the technology for managing it is improving all the time.
I guess the first question is where are you located (the country makes a difference as to what sort of care you can expect the medical professionals to give you) and what are your team doing to help you? Also, are your employers making any allowances for your need to test etc? And when you say you are eating badly, is that in the context of lactose, gluten or not being able to match your insulin to your carbs?
Sending you lots of virtual hugs. I hope things get better for you as soon as possible.