high calcium levels If he had low energy and tired This is likely caused by a thyroid issue.
Keep your melatonin up.
https://link.springer.com/article/10.1007/s00018-014-1659-3 If he has high calcium he can look into a high dose level of melatonin
This is a normal dose of Melatonin for covid issues. High dose is far higher then this
https://api.doris-loh.com/catalog/_2021_AA_MEL_Guidelines.pdf If anyone MUST go too a hospital. Make sure you sign in and put it in writing that you must authorize ANY drug. Might look into having someone you trust for medical power of attorney. The hospitals are federalized now. They're not safe.