What Causes Chronic Headaches, Joint Swelling And Water Retention In Body?

Hello,My daughter is 16 years old and has struggle with her health since she was 12 years old…started with chronic headaches, then on to joint swelling, no periods, fatigue, and stomach problems. She has dealt with these issues for four years and we have been to autonomic clinic at rainbow babies in cleveland where she received excellent care but unfortunately the cost were too high to continue about a year and a 1/2 ago. This past year she has struggled with keeping her weight stabilized. She has gained 14 pounds since august 2011 and now seems to be retaining even more fluid than in March of 2011. Her size has gone from a 0 to a 5 and barely fits in the last three months. She has continually exercised until this past week and eaten very healthy. We are concerned about the water retention. She is short of breath and has dark circles around her eyes. She is taking college courses and is doing well but as time goes on is having trouble focusing. She has all a s, and is doing her best but is worried that this is going to affect her test taking. She is 5 feet 2 inches and weighs 105 lbs. The weight is not what we are concerned about but the water retention.