Always hungry, lightheaded, dizzy etc?

As long as i can remember, ive always felt faint, dizzy, under "fog" spell, after i eat in the morning and before dinner. I'm always hungry! I eat all the time but I get this feeling almost every day and it is making me change the way i live, focusing around eating so i wont be hungry etc. This causes me to get anxious and eventually get depressed because i am sick of the feeling and being worried about feeling like this. Ive asked my doctor if it is hypoglycemia and she seems to ignore it (and not test me) and say it is just me overthinking with anxiety.