What Causes Hands Tremor, Headaches, Migraines, Legs Cramping, Abdomen And Back Pain?

I'm tired of not getting a diagnosis.. I am a 19 almost 20 year old female. I had anemia when I was 12-16 but it got treated and I got better. But now my symptoms are something different altogether. Shaking of hands, continued headache since I was 9 to this day, migraines from light, cramps on my legs mostly, spontaneous pain in lower left abdomen, spontaneous pain in left upper side of back, spontaneous loss of strength in general, breathing problems at times, pain in the hearth/lung region and so on. What's wrong? I have had full bloodwork done, my head scanned a few times, x-rays taken from my back, lungs, legs and so on. My blood pressure and blood work both came out as excellent every time, nothing wrong was found in anything. Ideas?