I'm in the process of attempting to quantify something I've always lived with yet has never been fully diagnosed; Although I've been in pain for as long as I can remember, my pediatrician was unable to determine why. One example is that my chronic stomach aches were explained as stress yet I've since learned that Migraine often presents as stomach aches in children. The few jobs I've been able to hold over the years have each made the pain and accompanying syndromes worse, to the point that I'm no longer able to maintain one activity for any length of time. My Hunny explains it better than I can:
"Dorian has about an average of three good hours of energy output per day, whether it be working on a light task, exercising creativity or even socializing with other people. After a certain threshold there is a rapid decline in mental acuity and rest is needed. Short naps don't do the trick as they do with most people, rather, a period of several hours is needed to “recharge,” and this can be spent either sleeping (although it is difficult for her to fall asleep) or engaged in something passive like television watching, as long as it doesn't take much thought or creativity. Reading takes too much mental acuity during this time and will often sap her energy further.
Her level of chronic pain on a daily basis takes its toll and often tasks her energy reserve early in the day after such chores as showering, preparing a meal or getting ready to go out. After the three-hour period her mental acuity declines to the extent where she has trouble tracking names and events, and her memory fades a great deal. She often experiences confusion during this time, and will frequently lose track of her own whereabouts and any tasks that need to be done will quickly be forgotten if she is stressed. When leaving her residence or a place of business if she has been out, she frequently forgets such simple, everyday objects such as her cane, bag and/or sunglasses - needing to return to retrieve them. This happens more often than not."