I hit my head in December 2013, and walking was a nightmare at first.

I started out walking very slowly, for very short distances. I'm talking less than a quarter of a mile. I couldn't even make it to the end of my street without feeling a surge in symptoms.

5 months ago, it took me 40 or 50 minutes to walk half a mile. Now I can walk a full mile in less than 20 minutes when I'm alone. It takes me 24 minutes if I am pushing my toddlers (they weigh 80 lbs together, and it's very exhausting for me to bring them on walks).

I am able to comfortably walk 2 miles at a slow, steady pace now without experiencing any symptoms. I have done as many as 4 miles in one day.

Yesterday, I decided to increase my pace. I was able to walk a mile in less than 11 minutes without experiencing any symptoms. However, I was extremely exhausted when I got home (I walked a second mile, but at a slower pace), and my blood pressure was very high. I take my blood pressure and heart rate before and after exercising.