Graves Disease, huh? Well I have Hashimoto's but still suspect you are my kind of diabetic ... and a reading over 200, in my books, is cause for MUCH concern. Low-carbing will prevent recurrence of that, but also get a meter and keep doing your own random testing.
What you need to get (once you have insurance) is a GAD Antibody test. And you might have to fight to get it. Your MD may not be familiar with it ... but keep asking. IA2s and ICAs are more common in Type1, but GADs predominate in LADA or T1.5. And my thyroid autoimmune disease is precisely why I suspected those antibodies would be there.
Next battle: Getting them to treat you like a type 1.5. After getting the Antibodies I got referral to an Endo, who told me I am a Type 2, with Antibodies.
Keywords to google and look up in PUBMED are GAD, GADA's, and LADA (Latent Autoimmune Diabetes of Adulthood).
Linda
Jun 8 A1c 5.9
Jul 09 ... C-pep 1.3, GAD-65 > 30
Mar 10 C-pep 2.8 (20 g carb); GAD 3.2
dx 02/09 in DKA
Levemir 6U per day
MetforminXR 1000 mg BID
Simvastatin 80 mg
Ramipril 5 mg
T4 125 mcg
Flax oil plus DHA/EPA
Vitamin D3, 4000 IU
Eating 30 - 45 g carb per day
Interval training on recumbent cycle
... one third of all Australians with type 1 diabetes reported being initially misdiagnosed as having the more common type 2 diabetes.