The problem is not with the thyroid gland.
It is the Parathyroid which sits under and below the thyroid. This was fried along with the thyroid during radiation. The Parathyroid is responsible for the release of calcium from bones.So as well as taking Levothyroxine for the thyroid he has been taking Calcitriol which is a form of Vitamin D to help him absorb calcium from his diet. Now that he is taking less of the supplement drinks and more smoothies his calcium levels have soared, making him one sick puppy.
All his electrolytes are out of kilter and he is having drugs to bind calcium, but supplements IV of Potassium, magnesium and phosphate. They told me this morning that he will likely be in hospital for another week as they correct this problem and the acute renal failure.
Wish I could just be his wife and not his nurse.
Tammy

Caregiver/advocate to Husband Kris age 59@ diagnosis
DX Dec '10 SCC BOT T4aN2bM0 HPV+ve.Cisplatin x3 35 IMRT.
PET 6/11 clear.
R) level 2-4 neck dissection 8/1/11 to remove residual node - necrotic with NED
Feb '12 Ca back.. 3/8/12 total glossectomy/laryngectomy/bilat neck dissection/partial pharyngectomy etc. clear margins. All nodes negative for disease. PEG in.
March 2017 - 5 years disease free. Woohoo!