I am undx since Oct. Doc is releasing me for work. I can only be in the heat for about 5 minutes or walk for about 5 minutes before my body shuts down on me. It then takes an hour to recover. I have a 30 min. walk from the parking lot to the classroom. I also have difficulty sitting and standing for very long. Not sure how to succeed at this, but it would be great if I can do it. Suggestions and advice are appreciated. Can't drive to classroom...need to carry everything in a backpack from car including food and water.