Usual mistakes in dieting

Recently been fasting and eating healthy and my sugars are still sky high. Seeing an endocrine this month. Just wanted to know if anyone have any tips or advice?

In your story, we lack your BMI and hip to waist ratio. It is a key marker.
First hypothesis: you are wrong on your calories and those coming from sugarS (Complex sugars are just high load sugar divided into several hours)
Second one: your endocrine pancreas is very weakened.
Third one:  both.

You can try low carb, I mean true LC diet. Don't worry about fasting at the moment just don't buy sugars and eliminate those present in your kitchen.
You can do it on the expensive mode: measure your blood Insulin, the HOMA index, your HbA1c and find the answer.