After Eating A Balanced Diet And Then A Small Desert,

After eating a balanced diet and then a small desert, I noticed a headache and heavy fullness. I took my blood sugar and it was 265. I have not been diagnosed with diabetes. My fasting blood sugar was 102 with it being twelve hours of fasting. My family has a history. I have also noticed eye changes and have to use my reading glasses more often. Do I need to see my doctor soon? Does this mean I have diabetes?