I have had "Persian gulf syndrome" as the VA calls it for over ten years. Sucks it is like being drunk on a roller coaster when it hits bad, mine came from a reaction to the H1N1 shot, next day till now I have it. And to make it worse I put a lift in right before I got sick. I definitely cant work on my back or overhead for any period of time. I just learned what my limits are and have to deal with it.