Ongoing health issues. Ct scan for head, stomach ultrasound and routine blood test all normal. Experiencing breathlessness, headaches&chest pain. Ideas?

Inadequate data. You have a complicated problem and not enough space here to list all your symptom details and tests. Stay with your doctor - it's not unusual to take several weeks to sort out difficult problems. Serial visits and additional testing will almost always get to the bottom of it. Hang in there! Good luck.