I've been dealing with some symptoms for a few months now, and it's starting to worry me. My heart races sometimes, I find myself short of breath, and occasionally my vision gets a bit blurry. I've also noticed a slight lack of balance and more frequent loose stools. I'm a 36-year-old female, 5'7" and 120 lbs. I try to keep active by walking a lot and exercising regularly. I quit smoking a few years back, but I consume more caffeine and sugar than I probably should. Generally, I think I eat pretty well. Should I be concerned about these symptoms? What could be causing them?

Based on your symptoms and medical history, it is important to consider the possibility of an overactive thyroid gland, also known as hyperthyroidism. The symptoms of rapid heart beat, shortness of breath, occasional blurry vision, slight lack of balance, and loose stools can be associated with this condition. I recommend you to consult a doctor for proper diagnosis and treatment plan.