Losartin 100 mg for 5 months. i now have on and off headaches for 2 months. plus a feeling of being off or unsteady. my blood pressure seems to be around 130/90 at its best and 150/100 at its worst. im going for mri this week. concerned?

I answered your question last 2 days. As I stated before, because of your age your doctor would order a brain imaging test and that is the case. Based on your question, three possibilities by the more likely to less likely: side effect of losartan, uncontrolled hypertension, and intracranial structural abnormality which you concern the most. I don't include other common causes of headache.