For about 3 to 4 months now I have been having these little episodes. They aren t debilitating so I haven t been to the doctor about it. But now it seems they are becoming more frequent and the exhaustion lasts longer. I feel this pressure in my head and face (sometimes tingly feeling in face), when I feel this I know that I am about to have issues walking at a regular gate because my legs feel weak and heavy. My arms feel heavy as well. All this is accompanied by dizziness and foggy thinking and blurry vision. When this passes, I am exhausted. I have just had blood work done and according to my physician, I am healthy. No blood pressure issues or blood sugar issues. Should I be concerned or is this something that will pass?