I’ve been going through much of the same thing in one way or another. I was diagnosed at 50. My GP and original endo labeled me Type 2, because I tested negative for autoantibodies, and my c-peptide and insulin levels (including injected insulin) were “normal.” HOWEVER, the c-peptide and insulin tests were done postprandial, rather than fasting, so the results were not “typical” for Type 2 (whatever typical is - usually high), plus, they ONLY tested me for GAD65. GAD65 is often the first antibody test to become positive; however, it can vanish after a time, not all Type 1’s test positive for it ever, and I was over 50 - and the older a person is when that test is taken, the less reliable it becomes. All-in-all, they should probably have tested the other autoantibodies before making a decision.
In the meanwhile, my c-peptide and insulin have been retested multiple times – and each time that have been lower than all previous tests. Last year, my last endo declared me to be Type 1., updated my records – and then RETIRED. The new endos I’ve seen have, so far, left the question open in their heads, though the one I’m seeing now is “reluctantly” leaving the diagnosis as “Type 1.5” without a clear-cut determination as to "which’ T1.5 it is. Not the best option, but, hopefully it works. Type 2 meds have universally caused me more unacceptable negative side-effects than benefits, so I am on insulin, via insulin pump and using a CGM – essentially “Type 1 care plan.” There have been no discussions about changing that plan, as it’s been working for me.