That is really the indication of temporal change. It happens to people with intensive reactions against certain reactions. It usually begins as allergic reaction then to some worse case (depend on situations). I think the better way to cure your husband is to dress him in four seasons weather's clothes and avoid these temporal changes. It will help greatly if one actually cure the disease, however sometimes it is part of his change to become healthier.
Hi
Welcome to the MedHelp forum!
Your husband could be suffering from postural or orthostatic hypotension in which the blood pressure falls on standing up. Other than this it can be hypoglycemia or vasovagal attack.
Since he also gets temperature fluctuations, the first things to be ruled out are thyroid disorders, adrenal gland problems, anemia, diabetes, hypoglycemia, liver diseases, low Vit B12, and vasovagal attacks.
Please consult your PCP for primary examination followed by proper referral.
Take care!