Dave, you can take a look at my hub written awhile back that was basically geared toward helping Veteran's who had been exposed to Agent Orange while in the Vietnam War. There are 2 links at the bottom of the article that explain why certain illnesses suffered by a Veteran who had been exposed to AO are considered presumptive conditions. This basically means that if they suffer from a condition that is on the list determined to be one that AO is shown to be a cause of, and the Veteran can prove they came in contact with AO during the Vietnam war, it will most likely be awarded Service Connection.
They also recognize that children of Veteran's exposed to AO also have been born with certain birth defects, how ever the only one that I am aware of that is being compensated as presumptive is Spina Bifida.
At any rate, it never hurts to check with the VA Administration and find out about your individual conditions you believe may be related. Be prepared for a possible drawn out process of filing documents and submitting medical records. Good luck!