I had the same concerns as Wahine, but I'm not a healthcare professional, so I kept my thoughts to myself. Now that the door has been opened, however, please allow me to express my concern over your description of your health issues.

You are a senior in college--what kinds of heart problems are you having? The knee I can understand, but not the heart. And bone density (and all the hormonal and nutritional stuff that goes along with it) is really a serious thing.

Please please go see another doctor. Go to the student health center ASAP and tell them everything--your fractures, your heart...do you have your period? If not, that's a clue to some potentially serious issues.

What we are today really does matter in what we will be tomorrow. Please take care and keep us posted. And see a new doctor right away!

EDIT: You said "am not sure there's anything else I can do." There is--demand that your concerns be addressed by your healthcare providers. You deserve better than being blow off like that.