Hi there froggygirl23,
Sounds like he may need to have his thyroid checked. I had many of those same symptoms when I was diagnosed hypothyroid about
20 years ago. I also had some blood glucose issues back then, too (hypoglycemia), even though I've recently been diagnosed a Type 1. Diabetes and thyroid issues are connected through endocrinology and metabolism so it could be concievable that they might be connected. If he's already having blood tests done, it's just another vial of blood to test for thyroid (TSH, T3, T4).
Now having said that, I would still encourage him to seek a doctor's advice as, really, the symptoms could be indicators of any number of possible issues (heart, circulation, endocrin, etc.), and a doctor would best be able to address the appropriate course of action. He needs to find out what he's dealing with so make the appointment as soon as possible. This is a case where ignorance is not bliss. Best of luck and well wishes. Keep us posted if you can