Late-ish response, but as a Type 1 diabetic myself ("Juvenile onset/insulin dependent" -- got it when I was 4 from an autoimmune response), this is not the end of the world. With the advancement of continuous glucose monitors (CGMs), long-term blood sugar (BS) studies have been done on non-diabetics and have seen wild fluctuations in levels depending on if they just ate, stress, and even time of day you woke up (so the old advice that BS levels are NEVER outside the 90-120 mg/dL range is pretty outdated it seems). In addition, don't blame yourself or your lifestyle too much; plain genetics plays into this a lot -- I knew a Palestinian lady who was slightly underweight, but a marathon runner who developed REALLY bad Type 2 diabetes in her early 40s (Middle Eastern ancestry has a higher risk of Type 2 Diabetes, along with some Native American groups apparently). Yes, deathfats can give themselves Type 2 Diabetes, but there are a metric shit ton of deathfats who have perfect BS levels too (much to my annoyance). I don't want to get too disability-rights activist-y and start sounding like an SJW, but despite the amazing advancements in diabetes care, the public attitude is still stuck in the mid-20th century.
Diabetes (Types 1, 2, and beyond) are nuanced and largely not your fault. You don't have to go keto to prove to yourself and everyone that you avoid sugar (besides, avoiding sugar doesn't always fix high BS -- your body always converts fat and liver glucagon in your body into BS, so even fasting can cause your BS to spike).
Hell, one of the reasons I joined the 'farms was all the Chris Chan diabetes jokes/comments and "losing foot" jokes which can only happen if you intentionally let your diabetes go out of control for YEARS (which is surprisingly hard to do because you feel like utter shit when you aren't actively controlling it). Worst-case scenario, if diet/exercise cannot help, diabetes medication can pretty much give you a standard of living comparable to regular joes TBH (granted you have to devote time and effort to this). I am not sure this is the case for you, but no matter what, you will survive and thrive like the rest of us.
IDK if you're in the 'states, but Walmart is the best place for blood glucose meters + test strips if you're concerned about this. Avoid name-brand unless your insurance is giving away the meter AND test strips for free. The accuracy difference between name-brand and store-brand BS monitors is basically nonexistent (really it comes to the individual features of the meter and how the test strips take blood, etc).
Thank you for listening to my TED talk. Apologies for rambling, but this is an issue near and dear to me. Feel free to DM me for more specific details.