Hi welcome to  HCM
 I have gone thru your query regarding your high prolactin level and  
severe headache . It is a matter of concern .
Dear ,normal prolactin level should not be higher than  200
 .  The higher the prolactin level, the more likely a 
pituitary gland tumor is present  and CAN BE CAUSE OF YOUR SEVERE HEADACHE for which you should consult you doctor for MRI or any test required .
 Many conditions can affect prolactin levels . 
 Liver disease (cirrhosis), kidney disease, and 
hypothyroidism.. lack of sleep, Stress can significantly raise prolactin levels and suppresses the Dopamine Hormone which helps stay focused, productive and motivated .
 Your derailed life style and faulty food habits is responsible for your ill health .
Rectifying  the conditions  will take you to path of recovery .
Modifying your life style food habits  , including regular exercise - walk ,yoga , jogging , swimming, any of them for 30 - 60 minutes and   pranayam -deep breathing  , KAPALBHATI  , Bharamari PRANAYAM  meditation & sound sleep ,and balanced diet should be included accoding to the deiticien's suggestion 
Studies found out that a single dose of 300 mg’s vitamin B6 found in whole foods diet rich in fruits and vegetables, especially dark, leafy greens, is thought to optimize anyone's health.
 The diet should also include whole grains;for fiber , legumes, especially soybeans; nuts and seeds; and cold-water fish Almonds,  bananas, low-fat dairy, and,& Antioxidants  ,sesame and pumpkin seed : Peppers, oranges, strawberries, cauliflower, Brussels sprouts
 Nuts and sunflower seeds, greens, broccoli, carrots and increase serum 
growth hormone level  significantly while also causing a sharp decline in prolactin levels in human & sustains health NATURALLY . and have no side effects . 
Avoid fine ,fried .fast foods ,tea coffee ,alcohol , smoking , hydration , un necessary medication . 
sleeplessness ,
constipation ,stress , anger. All increase toxins , lead to  ill health 
If You are taking 
Cabergoline ,I am sure  you have consulted your doctor for that . Inform him /her  any side  effects you undergo  .
 Cabergoline treatment, may inadvertently affect their ability to keep their blood pressure within normal limits, creating intense discomfort, dizziness, and even fainting upon standing and walking until the single first dose clears from their system
 ,I am sure  you have consulted your doctor for that . Inform him /her  any side  effects you undergo  .
Hope this helps solve your query Take care All the best