These are my symptoms what can it be? I have nausea, vomitting, chest pain, dizziness, sometime shortness of breath, back pain and leg pain

MANY THINGS. I can think of many things - some of which don't fit because of your age. You need to sit down with a dr and eliminate the ones that you can - then check outwhat's left. There wasn't space for you to mention everything that could be important. If your dr can't find a trail to follow your next stop is a psychotherapist. You don't want to have to keep worrying.
See family MD. Make sure that you get blood tests to rule out infections and be evaluated by a family dr. To exclude other medical problems. You may have fibromyalgia and need to be evaluated by a rheumatologist.