Hi curious, Welcome to healing well forum. I am very sorry about your dad and also your husband.
I am 33 yrs old and have bradycardia, sick sinus syndrome and severe orthostatic hypotension. I had a pacemaker implanted almost 2 yrs ago this september which helped for the low heart rate...before it was in the 20's but, it did nothing for my blood pressure. It came on pretty quickly I think. I recall being sick the whole summer before feeling run down and not right. Then one morning I woke up and I was totally dizzy and ended up passing out in the living room. In the end it was found that I acutally have a Autonomic Disorder which is neurological and pretty rare that has caused these issues.
Anyhow, I think finding any information on Agent Orange is going to be very difficult. It's one of the things that our government has tried (successfully) to hide the details of. It is sad that it was our service men and their families who paid the price for that decision and who are still paying.
Please do post again and let us know if you find anything out...Take care