I sympathise with you - it's so frustrating. I was not diagnosed for several years in the seventies - even though I had so many symptoms eg drinking loads because of continuous thirst, constant tiredness, constant headaches that often became migraine, terrible pain in my joints etc. I weighed 7...
I have always had variable blood sugars. It was called 'brittle diabetes' when I was diagnosed 40 years ago. I had the symptoms of diabetes long before that but, because my weight varied between 7 and a half stones and 8 and a half stones, I was told for many years that it was stress!