I have weakness and numbness in both legs, comes on suddenly, lasts for about a minute. Also, some dizziness. Happened twice over the summer. now happening more frequently. I had it happen 4x this evening. I have also been extremely anxious for the past 2 months. This usually seems to happen when I am in the middle of a home remodeling project, and working on a ladder, or on my knees on the floor. I am 70 years old. I had a stroke April 2015, vertebral artery occlusion. This has affected short term memory. I take plavix, metformin and lexapro. Can you guide me as to what could be the cause?