Hi
@static192, from my reading, not as professional advice or opinion.
I looked up thyromate.com with topic Thyroid and Blood Sugar 27/8/2017:
Basically hypothyroidism (under-active thyroid) causes low blood sugar as thyroid gland is a pace setter for the body's metabolism of things. The metabolism slows with less thyroid hormone(thyroxine) produced and less other hormones are produced such as cortisol and growth hormone and glucagon, all latter three important in combating low blood sugar levels. Also the liver does not store as much glucose or release it as quickly in a hypo situation.
Long standing hypothyroidism is said to affect kidney function, lower the heart's ability to pump blood and increases the risk of narrowing and disease of blood vessels.
The reverse is hyperthyroidism - things are speeded up, insulin is broken down more quickly, so BSLS rise higher and the liver is caught up in this and releases more stored glucose into the blood stream. The bone make lose extra calcium also.
I hope that helps answer your questions??