What causes my toes & fingers to get ice cold indoors with plenty of heat and no chill in other parts of my body? Excellent health, BP 120/70, BMI 20.

Raynaud. This sounds like raynauds syndrome. This is a condition where the blood vessels in the fingers clamp down and therefore the hands/fingers get cold. This can be a very painful condition. Treatments can include calcium channel blockers and topical nitroglycerin.