Hi elsie,
I have some of the same problems as you.
recently my endocrinologist did a 2 hour glucose and insuling study. If I remember correctly my numbers were as follows:
fasting glucose 87
2 hour glucose 140

fasting insulin 10
2 hour insulin 152
Doc dx me as glucose intolerant and insulin resistance and called it metabolic syndrome. She put me on low dose of metformin
Diabetes does run in my family and I did have a thryoid problem until I had it removed.
On another note my blood tests also showed me as iron deficient or iron anemic. I too tried the supplements and boy did they upset my gastro system.
But I recently started a prescription once a day iron supplement called repliva. Much more gentle and only once a day. And it has vitamin C in it.