### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hi.  I have been very stressed, cant sleep, and exhausted for about 4 months, was very stressed one night and started getting a loud, fast beating on the left side of my head, about 190 beats per second.  This went on all night and left the next day.  The diastolic blood pressure reading ranges around 95 when that happens.  This goes on every night and is so loud and fast that I very rarely get more than maybe 3 hours sleep a night.  This has been going on for over a month and it started last night at 8PM and is still going today at 5PM.  I had a cat scan and an ultrasound on the carotid arteries in my neck and they are okay.  Any suggestions?

### output:

You are suffering from severe headache at present as I understand from the history you provide. It is important to rule out serious neurological diseases in your case. As you seem to suggest, your CT scan of the head was normal. Your heart rate of 195 per minute (hope it is checked accurately) is very high. Such high headaches along with diastolic BP of 195 mmHg require investigation into the cause of headache. Hyperthyroidism, high BP itself, pheochromocytoma (rare tumor of a Chat Doctor.  You must consult a general physician (internal medicine) for detailed evaluation. Finally, severe attacks of migraine can cause severe headaches. If you have had migraine in the past or if any of your family members have migraine, this is likely to be migraine (provided you have ruled out other causes mentioned above). Internal Medicine specialist is the best doctor to consult for your problems. If the doctor also finds no serious disease causing headaches or if he says it is related to stress or depression, you may then consult a psychiatrist.