What could be causing excessive hair loss, extreme heat intolerance, low libido, jaw/cheek acne, & irregular periods? ive had tsh checked recently and it was normal?

In addition to hyperthyroidism, other causes of heat intolerance include certain medications, stress&anxiety,ovarian insufficiency. Hair loss can be from hormonal imbalance or hereditary factors. A dermatologist can advise you about hair loss and your acne. I assume you've consulted your gynecologist, also.

Polycystic ovary syndrome comes first to mind and among other possibilities. Talk to your Gyn doc about your symptoms.