ve both had it covered, but what about
thyroid function? An overactive
thyroid can cause racing heart and
weight loss, as the entire metabolism speeds up. A thyroid function test is a matter of only one blood draw, and can tell a lot. Usually TSH (thyroid stimulating hormone) is what's tested, but I wouldn't settle for that. Ask for TSH, T4, T3, everything.
I personally have autoimmune underactive thyroid, which I've been medicated for for 35 years, no probs.