I'm always hot & sweating, especially in the face. My thyroid is good & I'm not in menopause. What's causing this constant & continual sweating?

Hyperhidrosis. Hyperhidrosis is a condition where one has excessive sweating. This is due to a nerve disorder of the sweat glands. See your doctor to confirm, as well as to rule out other possible causes.
Sweating and hot. There are many endocrine organs in the body, not just the thyroid. Your adrenal glands and other systems should be checked out. See an endocrinologist to work up your hormonal balance.