<s>[INST] In the past 6 weeks I have been hospitalized for sudden spikes in my blood pressure. I get terrible headaches with them and so far my doctors are not able to tell me why this is happening. The last time it happened was last week and it spiked the highest ever, 198/108. After this last time it took about a day for it to come back to within a normal range. My doctors are stumped and so am I because this doesn t happen on an everyday basis and nothing seems to be in common with them other than the headache. [/INST] Welcome to HCM.My dear friend , first important  thing is that you should take you anti hypertensive(blood pressure medicines)  regularly and as advised by your treating doctor.. Headache and dizziness is very common in high blood pressure patients. I advise you ask your doctor( if he/she did not do same) for 24-hour urinary catacholamines and metanephrines to rule out pheochromocytoma. Because such type symptoms are very common in pheochromocytoma.Thanx for query. </s>