Today I had 2 episodes where I started feeling hot, sound in my ears was muffled, a little lightheaded, and a brief dull pain right side of back of neck. These were less than 20 minutes apart and lasted less than a minute each I'm guessing. A little later my legs were shaking and felt weak. Feel better after a nap except for dull headache across lower back of head. I'm a 65 year old female generally very healthy except I take diovan in the am and amlodipine bestylate at bedtime for high blood pressure. Any idea what causes this or what should I do. I'll probably see my primary care Dr. in the morning. Thanks for your input.