Hi @sara859 and welcome to Mayo Clinic Connect. While the people on Connect are not medical professionals, there are several people on here that have had similar issues when it comes to insulin.

I'd like to introduce you to @adamek3638, @marjou, @easygoingone, and @dorisena and to invite them to join the conversation.

Here is an article you might be interested in:
https://drcederquist.com/insulin-resistance/symptoms-of-insulin-resistance-tired-after-lunch
Have you had any other tests performed other than the glucose test?