Backpain middle chest pain, sudden mild dizziness and headache.. had echo ecg xray and blood work..its normal.. what could be causing this im 25 f

Dizziness headache: How long? If more than a few weeks, see md or cardiologist. Holter monitor for electrical disturbances not seen on ECG is not a bad idea. BP diary as well. And other exams like simple cxr is appropriate. Lots of things can still occur with "normal blood, ekg, and echo".

Anxiety: At 25 and with that workup i would at least have a visit with an anxiety of panic expert. They would be able to help you control these issues. Other possibilities include thyroid or low magnesium consider environmental factor. Keep a log on when you have your symptoms. You may find that emf exposure or other trigger might be associated.