Sound about right. Lack of Vit.D seems to have a big connection to thyriod problems.
That tablet to help with absorption is probably Vit.D.
Sorry forgot to say you should ask for complete vitamin and mineral test while you are having your calcium test as tiredness could be associated with other deficiencies such as iron. Low calcium levels can also cause other deficiencies so it is all linked. bestest.
My girlfriend had problems with calcium absorption and was taking 8 tablets (very large per day) later they added another tablet small to help with the absorption and the number of calcium she had to take was reduced. Sorry don't know the name of the tablet but I am sure your doctor will.
Bump to the top for another look.