Looking at your schedule just from a training perspective as everyone else has commented on the eating stuff already.
I'd hit the training early morning and leave the walking for your lunch hour? When I was doing the NEPA walks regularly I was usually hitting the gym before or after work and hitting the asphalt during lunch.
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."