Hi AV: I think it is natural to worry, especially as you have had so many problems and doctors opinions in the past. I would worry too. However, just keep the amount you are doing in perspective. There have been lots of medical advances since you were a kid and I'm sure there are things they could not do before that they can now. And it is good that you have done your research on this and found positive results.
Try to keep your mind on all the positives every time the worry comes up. Think about being able to keep up with your kids, or possibly being well enough to work again. That should help to keep you going.
I think you've made a good decision here. And we are all here to support you.
Cass