My daughter sees BLUE and is dizzy

My daughter suddenly had a dizzy spell, lost her visions for 30 seconds, then when her vision returned, everything was BLUE.  After 5 minutes her vision slowly returned to normal vision, however she has these random events of which I can not find a trigger point.  The colours vary too, she only sees large spots or stripes of any one colour, but when everything in her vision is one colour it is usually either BLUE or GREEN.  The colours occur before and after a dizzy spell.  She can be sitting relaxed or running around.  Since the first event, she has had a CT scan, EEG and several ECG, blood test.  In the last month she has become very sensitive to both light and noise, and will fall suddenly to the ground and get back up straight away.  They have ruled out Epilepsy, and diagnosed her with Migraine without pain.  But as the months have gone past, and the symptoms are increasing I find it hard to accept this diagnosis.  I don't believe a migraine can switch its symptoms on every time she is participating in physical activity.  She tells me her heart beats loud and fast sometimes, but another concern is the face that she has had a cold since February that we can not get rid of. 6 courses of antibiotics has failed to remove her runny nose and spitting up phlegm when coughing.  a chest xray shows no congestion, but this will not go away. What is wrong with my little girl, why has this suddenly happened and why are these symptoms getting worse?

[Caryopteris]

Food allergies can cause migraines and many other symptoms.  I would have her tested for Celiac disease (a problem with wheat) and also for dairy and nut allergies.