Is it bad to eat less?

I havent been eating much other than salad and a little carbs here and there whole day yesterday and breakfast today.

Yesterday, fasting was high of 103 but others were just fine.

I have a really bad headache and hungry feeling today. But today is bad..

Fasting was again 103, but breakfast only after 10g carbs was 149 😱

I feel like if i have to take insulin shots why am i torturing myself with almost no food